Some trouble whith undo FFD.

Spine Launcher 1.8.13-full
Windows 7 x86 6.1
Java 1.7.0-u6-unofficial Oracle Corporation
OpenJDK Server VM
Up to date: 1.8.16
Licensed to:

---

Spine 1.8.16 Professional, LWJGL
ATI Technologies Inc.
ATI Radeon HD 5700 Series
4.3.12443 Compatibility Profile Context 13.200.11.0
Started.
An unexpected error has occurred:
java.lang.IndexOutOfBoundsException: index can't be >= size: 1 >= 1
at gw.b(SourceFile:104)
at qI.a(SourceFile:220)
at qI.e(SourceFile:149)
at qG.f(SourceFile:95)
at zc.a(SourceFile:59)
at Bs.a(SourceFile:330)
at kq.a(SourceFile:321)
at o.a(SourceFile:70)
at o.a(SourceFile:70)
at aq.d(SourceFile:285)
at ae.run(SourceFile:227)
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)