Exception: Null Object Reference

[12345keddie]

Called from flxanimate.animate.FlxAnim.destroy (flxanimate/animate/FlxAnim.hx line 727)
Called from flixel.util.FlxDestroyUtil.destroy (flixel/util/FlxDestroyUtil.hx line 20)
Called from flxanimate.FlxAnimate.destroy (flxanimate/FlxAnimate.hx line 749)
Called from flixel.group.FlxTypedGroup.destroy (flixel/group/FlxGroup.hx line 145)
Called from flixel.FlxState.destroy (flixel/FlxState.hx line 186)
Called from flixel.addons.transition.FlxTransitionableState.destroy (flixel/addons/transition/FlxTransitionableState.hx line 75)
Called from flixel.addons.ui.FlxUIState.destroy (flixel/addons/ui/FlxUIState.hx line 331)
Called from states.PlayState.destroy (states/PlayState.hx line 5392)
Called from flixel.FlxGame.switchState (flixel/FlxGame.hx line 625)
Called from flixel.FlxGame.update (flixel/FlxGame.hx line 727)
Called from flixel.FlxGame.step (flixel/FlxGame.hx line 680)
Called from flixel.FlxGame.onEnterFrame (flixel/FlxGame.hx line 559)
Called from openfl.events.EventDispatcher.__dispatchEvent (openfl/events/EventDispatcher.hx line 426)
Called from openfl.display.DisplayObject.__dispatch (openfl/display/DisplayObject.hx line 1398)

Version: 0.13.2 (6345f9a60d62e202d63ffd92f69af3d76f3ff457)