### Log
```
2017-09-05 21:47:54.364 90510 [JavaFX Application Thread] ERROR editor.error-reporting - {:line 98}
java.lang.NullPointerException: null
at editor.app_view$refresh_app_title_BANG_.invokeStatic(app_view.clj:554)
at editor.app_view$refresh_ui_BANG_.invokeStatic(app_view.clj:561)
at editor.app_view$make_app_view$fn__37473.invoke(app_view.clj:611)
at editor.ui$__GT_timer$fn__11858.invoke(ui.clj:1628)
at editor.ui.proxy$javafx.animation.AnimationTimer$ff19274a.handle(Unknown Source)
at javafx.animation.AnimationTimer$AnimationTimerReceiver.lambda$handle$484(AnimationTimer.java:57)
at java.security.AccessController.doPrivileged(Native Method)
at javafx.animation.AnimationTimer$AnimationTimerReceiver.handle(AnimationTimer.java:56)
at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:357)
at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:267)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:506)
at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:490)
at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$404(QuantumToolkit.java:319)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.lambda$null$49(GtkApplication.java:139)
at java.lang.Thread.run(Thread.java:745)
2017-09-05 21:47:58.883 2084453 [Timer-0] DEBUG com.defold.editor.Start - checking for updat
```
Expected behaviour
Expand folder structure.
Actual behaviour
On click expand main folder, freezes the editor.
Steps to reproduce
Copy images to main/images folder, create new folder in main/images, move the images to new folder, come back to editor and expand the main folder.
@leotada Can't repro, is this still happening?
Yes, I tested now in other computer with Defold version 1.2.118. You have to move the images to new folder using an external file explorer.
Thanks for reporting back @leotada! Can you give me some more specs, what linux distribution are you running? window manager?
Fedora Linux 27 x64 runing Wayland.