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java.lang.NullPointerException: null	at editor.asset_browser$drag_entered.invokeStatic(asset_browser.clj:386)	at editor.asset_browser$drag_entered.invoke(asset_browser.clj:384)	at editor.asset_browser$setup_asset_browser$reify__78528.handle(asset_browser.clj:469)	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)	at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)	at javafx.event.Event.fireEvent(Event.java:198)	at javafx.scene.Scene$DnDGesture.handleExitEnter(Scene.java:3210)	at javafx.scene.Scene$DnDGesture.processTargetEnterOver(Scene.java:3098)	at javafx.scene.Scene$DnDGesture.access$6100(Scene.java:2909)	at javafx.scene.Scene$DropTargetListener.dragOver(Scene.java:2830)	at com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.lambda$handleDragOver$310(GlassSceneDnDEventHandler.java:110)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.tk.quantum.GlassSceneDnDEventHandler.handleDragOver(GlassSceneDnDEventHandler.java:107)	at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleDragOver$364(GlassViewEventHandler.java:723)	at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleDragOver(GlassViewEventHandler.java:722)	at com.sun.glass.ui.View.handleDragOver(View.java:697)	at com.sun.glass.ui.View.notifyDragOver(View.java:1025)	at com.sun.glass.ui.mac.MacPasteboard._putItemsFromArray(Native Method)	at com.sun.glass.ui.mac.MacPasteboard.putItemsFromArray(MacPasteboard.java:143)	at com.sun.glass.ui.mac.MacPasteboard.putItems(MacPasteboard.java:165)	at com.sun.glass.ui.mac.MacSystemClipboard.pushToSystem(MacSystemClipboard.java:223)	at com.sun.glass.ui.SystemClipboard.flush(SystemClipboard.java:51)	at com.sun.glass.ui.ClipboardAssistance.flush(ClipboardAssistance.java:59)	at com.sun.javafx.tk.quantum.QuantumClipboard.flush(QuantumClipboard.java:274)	at com.sun.javafx.tk.quantum.QuantumToolkit.startDrag(QuantumToolkit.java:1224)	at javafx.scene.Scene$DnDGesture.dragDetectedProcessed(Scene.java:2953)	at javafx.scene.Scene$DnDGesture.process(Scene.java:3022)	at javafx.scene.Scene$DnDGesture.access$8200(Scene.java:2909)	at javafx.scene.Scene$MouseHandler.process(Scene.java:3773)	at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)	at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)	at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)	at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)	at com.sun.glass.ui.View.handleMouseEvent(View.java:555)	at com.sun.glass.ui.View.notifyMouse(View.java:937)