ToastManager crashes on SC-01G of Android 5.0.

[justoneplanet]

+Devices
SC-01G

+What steps will reproduce the problem?
1.Delete a word on the dictionary tool.

+What is the expected output?
The selected word is deleted correctly.

+What do you see instead?
Crashing of the app.

+What version of the product are you using? On what operating system?
Android 5.0
Any versions have this problem.
You'll see the code of ToastManager.java in current master.
https://github.com/google/mozc/blob/master/src/android/src/com/google/android/inputmethod/japanese/userdictionary/ToastManager.java

+Please provide any additional information below.
"toast.setView(null);" generates the following exception...
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnTouchListener(android.view.View$OnTouchListener)' on a null object reference
at android.widget.Toast.setView(Toast.java:188)