IndexOutOfBoundsException when try use a keyboard gestures

Hello, first of all - thanks for great lib :)

Secondly - I use Fleksy keyboard that gives me a possibility to choose similar words after I press space, remove whole word via swipe back, and so on. Unfortunately when I try to use this gestures I receive this exception:

java.lang.IndexOutOfBoundsException: charAt: 6 >= length 6
    at android.text.SpannableStringBuilder.charAt(SpannableStringBuilder.java:114)
    at com.tokenautocomplete.TokenCompleteTextView$TokenTextWatcher.afterTextChanged(TokenCompleteTextView.java:1198)
    at android.widget.TextView.sendAfterTextChanged(TextView.java:7694)
    at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:9492)
    at android.text.SpannableStringBuilder.sendAfterTextChanged(SpannableStringBuilder.java:983)
    at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:505)
    at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:215)
    at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:30)
    at android.view.inputmethod.BaseInputConnection.deleteSurroundingText(BaseInputConnection.java:245)
    at android.view.inputmethod.InputConnectionWrapper.deleteSurroundingText(InputConnectionWrapper.java:66)
    at com.tokenautocomplete.TokenCompleteTextView$TokenInputConnection.deleteSurroundingText(TokenCompleteTextView.java:1431)
    at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:382)
    at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:77)
    at android.os.Handler.dispatchMessage(Handler.java:110)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:5341)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:515)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:830)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:646)
    at dalvik.system.NativeStart.main(Native Method)

Android 4.4.2
Lib: 2.0.2
Fleksy keyboard