underscore character bug

I love Heidi SQL. I use it all the time at work, but there is one small but annoying bug I was hoping you could fix. When in the table editor, if I type an underscore character in a column name sometimes Heidi will lose focus. It doesn't happen everytime. I've tried to figure out what conditions cause it, but so far I haven't been able to, other than it running for many days.

Thank you.

Oh, and I'm using Heidi 8.0.0.4452, and it's been happening since I started using it in version 7.