Access instance in the level

Development Pipeline & Plugins Editor Scripting
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I created a new c++ third person project and in the character’s tick-function I put this:

	UClass *test = GetClass();
	test->GetDefaultObject<ATestProjectCharacter>()->Testfunction();

Doesn’t make too much sense, but for testing-purposes it shouldn’t make a difference, if there already is an instance I could use, I assume.

This is the declaration of TestFunction()

	UFUNCTION(BlueprintImplementableEvent, Category = test)
	void Testfunction();

This is the Graph of the Character in the editor

http://puu.sh/cYMBB/71318997eb.png

starting the game results in a crash. It is caused by the GetPlayerCharacter. GetAllActorsOfClass also causes it. I assume everything refering to instances in the level somehow does. Just printing a normal string works though.

I assume I just don’t know something about the DefaultObject. It would be really helpful if someone could point out why this happens.