Thanks again for the detailed report!

I have completed one run through of the entire game, including all three levels of advertising, without encountering the crash. Like you, I've sold as few as 1 and as many as 21 fish. I have all the magic fish and have bred many of the exotic species, all without incident (I'm a very speedy player of Fish Tycoon, having tested it a zillion times since the original back in the early 2000s.)

I've got another device coming this week, and I'll be running another test on it. I hope we find the bug.