Undeterminable answer in missing numbers mode

Hello.

When playing Division -> Division by 1 to 10, missing numbers

I got a very odd equation:

0÷_=0

At this point I didn't know what to do.

I pressed 1... Wrong

2,3,4,5,6 wrong.

Only when I pressed 7 the answer was correct.

Maybe there could be a rule in the code to prevent such equations in the game as there is no other way than guessing to get the correct answer.

Information:

Game version: 2.10

Installed from: F-Droid