java.lang.IndexOutOfBoundsException: charAt: -1 < 0

We're currently using 4.6.1p4 and our app is live. The most common crash our users have seems to have the following stacktrace:

0 java.lang.IndexOutOfBoundsException: charAt: -1 < 0
1
at android.text.SpannableStringBuilder.charAt(SpannableStringBuilder.java:112)
2
at android.text.Selection.setSelection(Selection.java:81)
3
at android.text.Selection.setSelection(Selection.java:121)
4
at android.widget.Editor$InsertionHandleView.updateSelection(Editor.java:3695)
5
at android.widget.Editor$HandleView.positionAtCursorOffset(Editor.java:3415)
6
at android.widget.Editor$HandleView.updatePosition(Editor.java:3442)
7
at android.widget.Editor$PositionListener.onPreDraw(Editor.java:2283)
8
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:707)
9
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1938)
10
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
11
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4464)
12
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
13
at android.view.Choreographer.doCallbacks(Choreographer.java:555)
14
at android.view.Choreographer.doFrame(Choreographer.java:525)
15
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
16
at android.os.Handler.handleCallback(Handler.java:615)
17
at android.os.Handler.dispatchMessage(Handler.java:92)
18
at android.os.Looper.loop(Looper.java:137)
19
at android.app.ActivityThread.main(ActivityThread.java:4895)
20
at java.lang.reflect.Method.invokeNative(Native Method)
21
at java.lang.reflect.Method.invoke(Method.java:511)
22
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
23
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
24
at dalvik.system.NativeStart.main(Native Method)


It looks like it might be an OS issue from looking around ?