Error in winRt

Hello,

I build my game for winRt and everything smooth, till a random moment the game decides to crash in this function:

 find = CurrentManager._levelBlocks.Find((obj) =>
             {
                 if (obj == null) return false;
                 var lvlB = obj.GetComponent<LevelCube_Behaviour>();
                 if (lvlB != null)
                     return lvlB.Tile == tile;
                 return false;
             });

error report:

 First-chance exception at 0x77212EEC in Lupzigo.exe: Microsoft C++ exception: Platform::InvalidArgumentException ^ at memory location 0x04EDECF4. HRESULT:0x80070057 The parameter is incorrect.
 WinRT information: Type can not be null.

Has anyone has a clue why this happens? I can happen even when I do nothing in the game.