1. For demonstration purposes, create a class with a static method that clears the callqueue:

class StaticClearCQ
{
	static void ClearCQ()
	{
		GetGame().GetCallqueue().Clear();
	}
}

2. Open a world such as GM_Arland.ent and play it from the Workbench.
3. While the game is running, test the method using the console:

StaticClearCQ.ClearCQ();

It is executed successfully without any apparent issues.

4. Now, try the same but via the Callqueue:

GetGame().GetCallqueue().Call(StaticClearCQ.ClearCQ);

Once the ClearCQ method is executed, the Workbench crashes.