diff --git a/Attributes/ItemInstanceAttribute.vb b/Attributes/ItemInstanceAttribute.vb
index 53b9071..69701d7 100755
--- a/Attributes/ItemInstanceAttribute.vb
+++ b/Attributes/ItemInstanceAttribute.vb
@@ -9,6 +9,8 @@
 Option Strict On
 Option Explicit On
 
+Imports System.Linq
+
 ''' --------------------------------------------------------------------------------
 ''' <summary>
 ''' Specifies the type of class instance that will represent each database record / object.
@@ -26,10 +28,14 @@ Public Class ItemInstanceAttribute
     Private pobjType As Type
 
     ''' <summary>
-    ''' Indicates the 
+    ''' Indicates the type that inherits DatabaseObject or implements IDatabaseObject.
     ''' </summary>
     Public Sub New(ByVal objType As Type)
 
+        If Not objType.GetInterfaces().Contains(GetType(IDatabaseObject)) Then
+            Throw New ArgumentException("Type " & objType.FullName & " passed to ItemInstanceAttribute does not implement " & GetType(IDatabaseObject).FullName)
+        End If
+
         pobjType = objType
 
     End Sub
diff --git a/Database/ObjectReferenceEarlyBinding.vb b/Database/ObjectReferenceEarlyBinding.vb
index f3d2b35..013d75f 100644
--- a/Database/ObjectReferenceEarlyBinding.vb
+++ b/Database/ObjectReferenceEarlyBinding.vb
@@ -103,6 +103,7 @@ Friend Module ObjectReferenceEarlyBinding
 
 #If DEBUG Then
             excludeCollectionTypeNames.Add("DatabaseObjects.UnitTests.ItemInstanceTests+TableWithNoItemInstanceAttribute")
+            excludeCollectionTypeNames.Add("DatabaseObjects.UnitTests.AttributesInvalidTests+InvalidItemInstanceTypeCollection")
 #End If
 
             Return _