com.freepaypalcashormoney Crash Report

USER_COMMENT=null
ANDROID_VERSION=5.0.2
APP_VERSION_NAME=1.101
BRAND=lge
PHONE_MODEL=LG-D415
CUSTOM_DATA=
STACK_TRACE=java.lang.StringIndexOutOfBoundsException: length=0; regionStart=1; regionLength=1
at java.lang.String.startEndAndLength(String.java:504)
at java.lang.String.substring(String.java:1333)
at com.freepaypalcashormoney.LoginActivity.onRegister(LoginActivity.java:869)
at com.freepaypalcashormoney.LoginActivity.access$100(LoginActivity.java:57)
at com.freepaypalcashormoney.LoginActivity$1$1.onCompleted(LoginActivity.java:218)
at com.facebook.GraphRequest$1.onCompleted(GraphRequest.java:301)
at com.facebook.GraphRequest$5.run(GraphRequest.java:1380)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5354)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:908)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:703)