Hi,

I created bone with mesh attachment, added skinning and when I try to duplicate this bone Spine is crashing
I attach spine project with that bone and mesh.

Here is my log:

Spine Launcher 1.8.14-full
Windows 8 x86 6.2
Java 1.7.0-u6-unofficial Oracle Corporation
OpenJDK Server VM
Launching: 1.9.01
Licensed to: ...
Spine 1.9.01 Professional, LWJGL
NVIDIA Corporation
GeForce GTX 770/PCIe/SSE2
4.4.0
Using customized hotkeys.
Started.
An unexpected error has occurred:
java.lang.ArrayIndexOutOfBoundsException: -1
   at gz.a(SourceFile:133)
   at lW.a(SourceFile:396)
   at lW.a(SourceFile:354)
   at mM.J(SourceFile:320)
   at nc.a(SourceFile:2130)
   at ft.a(SourceFile:28)
   at dP.a(SourceFile:166)
   at dP.a(SourceFile:131)
   at com.badlogic.gdx.scenes.scene2d.ui.Button.c(SourceFile:112)
   at er.b(SourceFile:86)
   at fv.b(SourceFile:89)
   at dV.a(SourceFile:57)
   at dX.b(SourceFile:272)
   at o.b(SourceFile:94)
   at at.e(SourceFile:305)
   at ah.run(SourceFile:224)
   at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:711)
   at java.awt.EventQueue.access$000(EventQueue.java:104)
   at java.awt.EventQueue$3.run(EventQueue.java:672)
   at java.awt.EventQueue$3.run(EventQueue.java:670)
   at java.security.AccessController.doPrivileged(Native Method)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:681)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)