Possible Bug in RM4 Action Time Difference

I'm on firmware:, and am getting a consistent error page whenever I select a Time Variable in the Actions->Set Variable->Time Difference settings. After this error, occurs, and hit done, it returns to the rule settings menu, but if I click actions, it goes right back to the error screen without any other display. If I click done on the rule, and re-enter, and select actions, the error page is immediately displayed again.


The logs show this error message:
app:722020-05-08 12:18:06.331 am errorjava.lang.NullPointerException: Cannot get property 'val' on null object on line 654 (selectActions)

The only Global Variables Set:

Global Variables showing in Rule 4:

Which happen to also show some global variables that I previously deleted and/or typed and changed the name prior to saving the variable (GV_ and GV_Text_1)

Am I doing something wrong, or is this a bug?