After using the addon for a while, it won't load any past dungeon runs

[holyman2k]

I got the below error from bugstack

7x MyDungeonsBook/UI/Main.lua:29: attempt to index field 'challengeDetailsFrame' (a nil value)
[string "@MyDungeonsBook/UI/Main.lua"]:29: in function <MyDungeonsBook/UI/Main.lua:26>
[string "=[C]"]: ?
[string "@AutoCombatLogger/Libs/AceGUI-3.0-41/AceGUI-3.0.lua"]:66: in function <...dOns/AutoCombatLogger/Libs/AceGUI-3.0/AceGUI-3.0.lua:64>
[string "@AutoCombatLogger/Libs/AceGUI-3.0-41/AceGUI-3.0.lua"]:300: in function `Fire'
[string "@AutoCombatLogger/Libs/AceGUI-3.0-41/widgets/AceGUIContainer-Frame.lua"]:29: in function <...er/Libs/AceGUI-3.0/widgets/AceGUIContainer-Frame.lua:28>
[string "=[C]"]: in function `Hide'
[string "@AutoCombatLogger/Libs/AceGUI-3.0-41/widgets/AceGUIContainer-Frame.lua"]:125: in function `Hide'
[string "@AutoCombatLogger/Libs/AceGUI-3.0-41/widgets/AceGUIContainer-Frame.lua"]:21: in function <...er/Libs/AceGUI-3.0/widgets/AceGUIContainer-Frame.lua:19>