An exception was catched while rendering.
java.lang.IndexOutOfBoundsException: Index: 82, Size: 82
at java.util.ArrayList.RangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Does that mean the render thread try to render something which some other thread already delete?
Yes, either another thread or a draw/render method has removed a spatial while rendering. That should not happen. Ensure you are rendering only while no other thread is modifying the scenegraph, or if you overwrite any draw/onDraw methods don't alter the scenegraph in there.