ptr == NULL || GET_CURRENT_ALLOC_ROOT_HEADER() ...

Hi everyone!! i have a android unity game that works well, but i want to put ads into my game. So, i get put ads (by admob) into my game but when my player dies (before when player dies the player was desactivated and activate de gameover screen) but now, my game stoped and bring me that error:

ptr == NULL || GET_CURRENT_ALLOC_ROOT_HEADER() == NULL || GET_CURRENT_ALLOC_ROOT_HEADER() == GET_ALLOC_HEADER(s_MonoDomainContainer, kMemMono) UnityEngine.GUIUtility:BeginGUI(Int32, Int32, Int32)

ptr == NULL || GET_CURRENT_ALLOC_ROOT_HEADER() == NULL || GET_CURRENT_ALLOC_ROOT_HEADER() == GET_ALLOC_HEADER(s_MonoDomainContainer, kMemMono) UnityEditor.DockArea:OnGUI()

But these errors repeat so much times (the red alert give me 999+ errors). Why unity brings me that error? How can i solve it?

Thanks!