weird error - playmaker VS facebook

I got both playmaker and facebook (via Soomla Profile) implemented in my scene.
When I get a login panel from facebook and then I close it, this nefarious error appears in Console repeatedly (every frame?):

{NullReferenceException: Object reference not set to an instance of an object
UnityEngine.GUI.CallWindowDelegate (UnityEngine.WindowFunction func, Int32 id, UnityEngine.GUISkin _skin, Int32 forceRect, Single width, Single height, UnityEngine.GUIStyle style) (at C:/buildslave/unity/build/artifacts/generated/common/runtime/GUIBindings.gen.cs:1458)}

By trial and error I found out that it stops when the PlayMakerGUI script is disabled it stops happening.

Anyone knows how to fix this?

No clue, you might have better luck in the playmaker forum:

Good luck!

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