Making call through custom app using UiAutomator causes phone app to crash in Samsung Galaxy edge

I am testing an app that intiates call to number given in the textbox. I am using UiAutomator to click on a button that makes the call. When i click on button system Phone app gets crashed. It works perfectly fine when done manually.

I get following

java.lang.IllegalStateException: Accessibility off. Did you forget to check that? at android.view.accessibility.AccessibilityManager.sendAccessibilityEvent(AccessibilityManager.java:365) at android.view.ViewRootImpl.requestSendAccessibilityEvent(ViewRootImpl.java:7639) at android.view.View.sendAccessibilityEventUncheckedInternal(View.java:6912) at android.view.View.sendAccessibilityEventUnchecked(View.java:6891) at com.android.incallui.InCallActivity$5.run(InCallActivity.java:439) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6682) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)