resolve java.lang.NullPointerException

Previous Android logcat output:

E/AndroidRuntime(22977): java.lang.NullPointerException
E/AndroidRuntime(22977): 	at com.ionic.keyboard.IonicKeyboard$2.run(IonicKeyboard.java:75)
E/AndroidRuntime(22977): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
E/AndroidRuntime(22977): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
E/AndroidRuntime(22977): 	at java.lang.Thread.run(Thread.java:841)
W/ActivityManager(  766):   Force finishing activity