NullReferenceException in apps on Windows 8 RTM

I migrate an app from windows 8 RP to RTM.

I didn't have problem on RP but on RTM SQLite throw very often an exception when my app launch.

Here is the exception details:

  System.NullReferenceException was unhandled by user code
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=mscorlib
  StackTrace:
       at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
       at System.Collections.Generic.Dictionary`2.set_Item(TKey key, TValue value)
       at SQLite.SQLiteConnection.GetMapping(Type type) in \SQLite.cs:line 234
       at SQLite.SQLiteConnection.CreateTable(Type ty) in \SQLite.cs:line 308
       at SQLite.SQLiteAsyncConnection.<>c__DisplayClass1.<CreateTablesAsync>b__0() in \SQLiteAsync.cs:line 

94
       at System.Threading.Tasks.Task`1.InnerInvoke()
       at System.Threading.Tasks.Task.Execute()

Can you investigate on it?

Start by reproducing the Windows 8 RTM launch failure and read SQLite.cs around line 234 in SQLiteConnection.GetMapping and line 308 in CreateTable. Trace the call from SQLiteAsync.cs's CreateTablesAsync entry point and determine why the dictionary receives a null value; done means the reported NullReferenceException no longer occurs during table creation.