crash fix

java.lang.NullPointerException
	at android.support.v4.widget.DrawerLayout.isContentView(SourceFile:853)
	at android.support.v4.widget.DrawerLayout.onInterceptTouchEvent(SourceFile:880)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:848)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:872)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:872)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:872)
	at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:872)
	at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1695)
	at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
	at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
	at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1679)
	at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2196)
	at android.view.ViewRoot.handleMessage(ViewRoot.java:1880)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:130)
	at android.app.ActivityThread.main(ActivityThread.java:3717)
	at java.lang.reflect.Method.invokeNative(Native Method)
	at java.lang.reflect.Method.invoke(Method.java:507)
	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
	at dalvik.system.NativeStart.main(Native Method)