That sounds like you used an adhoc script, or worse, a database copy, to "migrate" the project, and you've missed at least one of the counter updates you needed to do.
Short answer is that this is going to break when you hit that number range, and what you may need to do is go back to the backup you took before you did the migration (then you can do the migration again, properly)
You *might* be able to avoid the crash if you've only missed the one counter. But I can't tell you that it's going to work without knowing how you did the migration.
That fix is to stop Jira, update the counter directly in the database so that it's higher than the highest number in the project and restart Jira. (From memory, it's pcount on the project table, but check the other columns in that table too, I might have the wrong name of column)
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