Crashes whenever you walk on a modded block that adds custom sounds for steps

[DerLeole]

As another user already explained on your forum thread:
The crash comes from blocks that use a custom sound for stepping on them beyond the usual dirt/stone/wood/sand sounds. For example, the slime blocks in Tinker's Construct use the slime hopping sound for steps. Trying to walk over those with this mod will cause a crash. It isn't just because the block is a modded block, it's because they have their own sound for stepping on them.

Here you have a crashreport showing that crash in action (dont mind all the other mods in there its in a modpack but the crash also appears when using only your mod):

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 08.02.16 23:42
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at eu.ha3.mc.presencefootsteps.mcpackage.implem.AcousticsManager.playStep(AcousticsManager.java:56)
at eu.ha3.mc.presencefootsteps.game.system.PFSolver.playAssociation(PFSolver.java:64)
at eu.ha3.mc.presencefootsteps.game.system.PFReaderH.simulateFootsteps(PFReaderH.java:115)
at eu.ha3.mc.presencefootsteps.game.system.PFReaderH.generateFootsteps(PFReaderH.java:66)
at eu.ha3.mc.presencefootsteps.game.system.PFIsolator.onFrame(PFIsolator.java:51)
at eu.ha3.mc.presencefootsteps.game.system.PFHaddon.onFrame(PFHaddon.java:359)
at eu.ha3.mc.haddon.litemod.LiteBase.onTick(LiteBase.java:99)
at com.mumfrey.liteloader.core.event.HandlerList$Tickable8.onTick(HandlerList$Tickable8.java:100)
at com.mumfrey.liteloader.client.ClientEvents.onTick(ClientEvents.java:416)
at com.mumfrey.liteloader.client.CallbackProxyClient.onTick(CallbackProxyClient.java:63)
at com.mumfrey.liteloader.core.event.EventProxy.$event00005(EventProxy.java:216)
at net.minecraft.client.Minecraft.func_71411_J(Unknown Source)
at net.minecraft.client.Minecraft.func_99999_d(Unknown Source)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Stacktrace:
at eu.ha3.mc.presencefootsteps.mcpackage.implem.AcousticsManager.playStep(AcousticsManager.java:56)
at eu.ha3.mc.presencefootsteps.game.system.PFSolver.playAssociation(PFSolver.java:64)
at eu.ha3.mc.presencefootsteps.game.system.PFReaderH.simulateFootsteps(PFReaderH.java:115)
at eu.ha3.mc.presencefootsteps.game.system.PFReaderH.generateFootsteps(PFReaderH.java:66)
at eu.ha3.mc.presencefootsteps.game.system.PFIsolator.onFrame(PFIsolator.java:51)
at eu.ha3.mc.presencefootsteps.game.system.PFHaddon.onFrame(PFHaddon.java:359)
at eu.ha3.mc.haddon.litemod.LiteBase.onTick(LiteBase.java:99)
at com.mumfrey.liteloader.core.event.HandlerList$Tickable8.onTick(HandlerList$Tickable8.java:100)
at com.mumfrey.liteloader.client.ClientEvents.onTick(ClientEvents.java:416)
at com.mumfrey.liteloader.client.CallbackProxyClient.onTick(CallbackProxyClient.java:63)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Leolele99'/15112, l='MpServer', x=841,93, y=71,41, z=1214,92]]
Chunk stats: MultiplayerChunkCache: 261, 261
Level seed: 0
Level generator: ID 02 - largeBiomes, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (181,88,-4013), Chunk: (at 5,5,3 in 11,-251; contains blocks 176,0,-4016 to 191,255,-4001), Region: (0,-8; contains chunks 0,-256 to 31,-225, blocks 0,0,-4096 to 511,255,-3585)
Level time: 599167004 game time, 601375113 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 11 total; [EntityCustomNpc['Glacial_Prince'/11568, l='MpServer', x=865,50, y=74,00, z=1217,50], EntityOtherPlayerMP['Flaming_Spirit'/8834, l='MpServer', x=683,69, y=72,50, z=1204,91], EntityCustomNpc['Ice_Monarch'/11559, l='MpServer', x=829,50, y=10,26, z=1217,50], EntityCustomNpc['Ice_Monarch'/11561, l='MpServer', x=829,50, y=69,00, z=1217,50], EntityClientPlayerMP['Leolele99'/15112, l='MpServer', x=841,93, y=71,41, z=1214,92], EntityCustomNpc['Frozen_Guard'/11563, l='MpServer', x=832,53, y=69,00, z=1211,47], EntityOtherPlayerMP['coolhoXD'/11484, l='MpServer', x=-88,69, y=135,76, z=2607,31], EntityOtherPlayerMP['coolhoXD'/11484, l='MpServer', x=-135,00, y=143,59, z=2594,28], EntityOtherPlayerMP['coolhoXD'/11484, l='MpServer', x=-83,48, y=167,97, z=2640,58], EntityOtherPlayerMP['BugFaceHD'/8762, l='MpServer', x=752,56, y=73,00, z=1215,41], EntityCustomNpc['Frozen_Guard'/11565, l='MpServer', x=832,69, y=69,00, z=1223,41]]
Retry entities: 0 total; []
Server brand: BungeeCord (git:BungeeCord-Bootstrap:1.8-SNAPSHOT:"01ce21e":unknown) <- kcauldron,cauldron,craftbukkit,mcpc,fml,forge
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Unknown Source)
at net.minecraft.client.Minecraft.func_99999_d(Unknown Source)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_65, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 11825669704 bytes (11277 MB) / 12884901888 bytes (12288 MB) up to 12884901888 bytes (12288 MB)
Mod Pack: Unknown / None
LiteLoader Mods: 1 loaded mod(s)
- Presence Footsteps version r5 for 1.7.10
LaunchWrapper: 50 active transformer(s)
- Transformer: cpw.mods.fml.common.asm.transformers.PatchingTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.MarkerTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.SideTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.EventSubscriptionTransformer
- Transformer: net.minecraftforge.classloading.FluidIdTransformer
- Transformer: codechicken.lib.asm.ClassHeirachyManager
- Transformer: codechicken.core.asm.InterfaceDependancyTransformer
- Transformer: codechicken.core.asm.TweakTransformer
- Transformer: codechicken.core.asm.DelegatedTransformer
- Transformer: codechicken.core.asm.DefaultImplementationTransformer
- Transformer: com.pau101.fairylights.core.FairyLightsClassTransformer
- Transformer: fastcraft.asm.FastCraftTransformer
- Transformer: invtweaks.forge.asm.ContainerTransformer
- Transformer: codechicken.nei.asm.NEITransformer
- Transformer: openeye.asm.MultiTransformer
- Transformer: ak.potionextension.asm.PotionEffectTransformer
- Transformer: ak.potionextension.asm.PotionArrayTransformer
- Transformer: lain.mods.skinport.asm.ASMTransformer
- Transformer: com.mumfrey.liteloader.transformers.event.EventProxyTransformer
- Transformer: com.mumfrey.liteloader.launch.LiteLoaderTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.CrashReportTransformer
- Transformer: me.guichaguri.betterfps.transformers.MathTransformer
- Transformer: me.guichaguri.betterfps.transformers.EventTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.AccessTransformer
- Transformer: net.minecraftforge.transformers.ForgeAccessTransformer
- Transformer: mods.battlegear2.coremod.transformers.BattlegearAccessTransformer
- Transformer: codechicken.core.asm.CodeChickenAccessTransformer
- Transformer: invtweaks.forge.asm.ITAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ItemStackTransformer
- Transformer: lumien.chunkanimator.asm.ClassTransformer
- Transformer: lumien.resourceloader.asm.ClassTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityPlayerTransformer
- Transformer: mods.battlegear2.coremod.transformers.ModelBipedTransformer
- Transformer: mods.battlegear2.coremod.transformers.NetClientHandlerTransformer
- Transformer: mods.battlegear2.coremod.transformers.NetServerHandlerTransformer
- Transformer: mods.battlegear2.coremod.transformers.PlayerControllerMPTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemRendererTransformer
- Transformer: mods.battlegear2.coremod.transformers.MinecraftTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemStackTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemInWorldTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityAIControlledByPlayerTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityOtherPlayerMPTransformer
- Transformer: org.blockartistry.mod.DynSurround.asm.Transformer
- Transformer: cpw.mods.fml.common.asm.transformers.TerminalTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.LiteLoaderEventInjectionTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.MinecraftOverlayTransformer
- Transformer: com.mumfrey.liteloader.common.transformers.LiteLoaderPacketTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAPITransformer
JVM Flags: 5 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms12288m -Xmx12288m -XX:+UseG1GC -XX:MaxGCPauseMillis=4
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 103
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 89 mods loaded, 89 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJA mcp{9.05} Minecraft Coder Pack
UCHIJA FML{7.10.99.99} Forge Mod Loader
UCHIJA Forge{10.13.4.1448} Minecraft Forge
UCHIJA AppleMilkCore{1.1.0} AppleMilkCore
UCHIJA CodeChickenCore{1.0.7.47} CodeChicken Core
UCHIJA ivtoolkit{IvToolkit} 1.0.4
UCHIJA NotEnoughItems{1.0.5.118} Not Enough Items
UCHIJA OpenEye{0.6} OpenEye
UCHIJA PotionExtensionCore{1.7.10-1.1.0} PotionExtensionCore
UCHIJA FamiliarsAPI{1.7.10} Familiars API
UCHIJA dynamicswordskills{1.6} Dynamic Sword Skills
UCHIJA battlegear2{1.7.10} Mine & Blade Battlegear 2 - Bullseye
UCHIJA DamageIndicatorsMod{3.2.3} Damage Indicators
UCHIJA abm{0.3.2} [Anime Battle Mod](ABM 0.3.2 for 1.7.10.jar)
UCHIJA Baubles{1.0.1.10} Baubles
UCHIJA adventurebackpack{1.7.10-0.8b} Adventure Backpack
UCHIJA AnimationAPI{1.2.4} AnimationAPI
UCHIJA DCsAppleMilk{1.7.10_2.8g} Apple&Milk&Tea!
UCHIJA DCsNEIPluginAMT{1.7.10_1.0a} NEIPluginForAMT
UCHIJA armourersWorkshop{1.7.10-0.38.1.98} Armourer's Workshop
UCHIJA plushieWrapper{0.0.0} Plushie Wrapper
UCHIJA Artifacts{1.1.1} Artifacts
UCHIJA betterstorage{0.13.1.127} BetterStorage
UCHIJA BiblioCraft{1.11.4} BiblioCraft
UCHIJA ChickenChunks{1.3.4.19} ChickenChunks
UCHIJA ChunkAnimator{@Version@} Chunk Animator
UCHIJA CustomMainMenu{1.9.2} Custom Main Menu
UCHIJA customnpcs{1.7.10d} CustomNpcs
UCHIJA PTRModelLib{1.0.0} PTRModelLib
UCHIJA props{2.2.1} Decocraft
UCHIJA dungeonpack{1.7.10-1.0} Dungeon Pack
UCHIJA dsurround{1.0.4.5BETA} Dynamic Surroundings
UCHIJA ExtrabiomesXL{3.16.2} ExtrabiomesXL
UCHIJA fairylights{1.4.0} Fairy Lights
UCHIJA DefaultMobPack{1.7.10} DefaultMobPack
UCHIJA ExtendedFamPack{1.7.10} ExtendedFamPack
UCHIJA FastCraft{1.21} FastCraft
UCHIJA ForgeMultipart{1.2.0.345} Forge Multipart
UCHIJA McMultipart{1.2.0.345} Minecraft Multipart Plugin
UCHIJA foxlib{1.7.10-0.7.0} FoxLib
UCHIJA CARuins{0.1.9} Cellular Automata Generator
UCHIJA GreatWallMod{0.1.9} Great Wall Mod
UCHIJA WalledCityMod{0.1.9} Walled City Generator
UCHIJA gvc{0.6.1} §aGliby's§f Voice Chat Mod
UCHIJA godweapons{2.5} [Gods' Weapons](godweapons - 1.7.10 - 2.6.jar)
UCHIJA GrimoireOfGaia{1.0.0} Grimoire of Gaia 3
UCHIJA HealingFountains{1.0.0} [HealingFountains](Healing Fountain.zip)
UCHIJA inventorytweaks{1.59-dev-152-cf6e263} Inventory Tweaks
UCHIJA levels{r2.2.2} Levels
UCHIJA lycanitesmobs{1.13.0.5 - MC 1.7.10} [Lycanites Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA arcticmobs{1.13.0.5 - MC 1.7.10} [Lycanites Arctic Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA demonmobs{1.13.0.5 - MC 1.7.10} [Lycanites Demon Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA desertmobs{1.13.0.5 - MC 1.7.10} [Lycanites Desert Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA forestmobs{1.13.0.5 - MC 1.7.10} [Lycanites Forest Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA freshwatermobs{1.13.0.5 - MC 1.7.10} [Lycanites Freshwater Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA infernomobs{1.13.0.5 - MC 1.7.10} [Lycanites Inferno Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA junglemobs{1.13.0.5 - MC 1.7.10} [Lycanites Jungle Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA mountainmobs{1.13.0.5 - MC 1.7.10} [Lycanites Mountain Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA plainsmobs{1.13.0.5 - MC 1.7.10} [Lycanites Plains Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA saltwatermobs{1.13.0.5 - MC 1.7.10} [Lycanites Saltwater Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA shadowmobs{1.13.0.5 - MC 1.7.10} [Lycanites Shadow Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA swampmobs{1.13.0.5 - MC 1.7.10} [Lycanites Swamp Mobs](LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJA Mantle{1.7.10-0.3.2.jenkins191} Mantle
UCHIJA maplecrafted{1.7} Offcial MapleCrafted Mod
UCHIJA MetallurgyCore{4.0.4} Metallurgy Core
UCHIJA TConstruct{1.7.10-1.8.8.build988} Tinkers' Construct
UCHIJA Metallurgy{4.0.6} Metallurgy 4
UCHIJA MineMenu{1.2.0} MineMenu
UCHIJA recallstones{0.5.2} Recall Stones
UCHIJA RedstonePasteMod{1.6.2} Redstone Paste
UCHIJA ResourceLoader{1.2} Resource Loader
UCHIJA Roguelike{1.3.6.3} Roguelike Dungeons
UCHIJA RPGAdvMod{1.0.0} RPGAdvMod
UCHIJA runicdungeons{1.0.8b} Runic Dungeons
UCHIJA saoui{1.4} Sword Art Online UI
UCHIJA skinport{1.7.10-v6} SkinPort
UCHIJA soundfilters{0.8_for_1.7.X} Sound Filters
UCHIJA sco{0.9} Official Sword Craft Online Mod
UCHIJA SCOTeleCrystals{0.9} SCOTeleCrystals
UCHIJA kitchen{1.3.16} The Kitchen Mod
UCHIJA tinkersdefense{1.2} Tinkers' Defense
UCHIJA torchLevers{1.4.2} Torch Levers
UCHIJA TravellersGear{1.16.6} Traveller's Gear
UCHIJA TwilightForest{2.3.7} The Twilight Forest
UCHIJA vending{1.2.3} vending
UCHIJA weaponmod{v1.14.3} Balkon's WeaponMod
UCHIJA yegamolchattels{1.1.1.1} Ye Gamol Chattels
UCHIJA libsandstone{1.0.0} libsandstone
UCHIJA ForgeMicroblock{1.2.0.345} Forge Microblocks
GL info: ' Vendor: 'NVIDIA Corporation' Version: '4.5.0 NVIDIA 359.06' Renderer: 'GeForce GTX 760/PCIe/SSE2'
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
Launched Version: 1.7.10-Forge10.13.4.1448-1.7.10
LWJGL: 2.9.1
OpenGL: GeForce GTX 760/PCIe/SSE2 GL version 4.5.0 NVIDIA 359.06, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: [PresenceFootstepsOfficial.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)