Have spent some time away from PlayMaker due to work, but finally getting back into it. Got a bug straight off the bat
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If you add an FSM to a GameObject via the drop down menu "PlayMaker->Components->Add FSM To Selected Objects" with the PlayMaker Editor Window closed, this error occurs :
NullReferenceException: Object reference not set to an instance of an object
HutongGames.PlayMakerEditor.FsmEditor.SelectState (HutongGames.PlayMaker.FsmState state, Boolean frameState)
HutongGames.PlayMakerEditor.FsmBuilder.AddFsmToSelected ()
PlayMakerMainMenu.AddFsmToSelected () (at Assets/PlayMaker/Editor/PlayMakerMainMenu.cs:121)
This error does not appear if the editor window is open and the drop down menu is used, and does not happen if adding an FSM directly through the Editor Window.