Bug: After editing a block and hit ok. I'm stuck in this message

Hi, I’m not sure exactly why this happen. I’ll describe what I’ve done leading up to this.


I have a block that I edited. Once I added my new breps into the block, I hit ok button on the block edit window and this is the error message I got. I don’t think I attempted to delete anything in the first place. When I hit ok, enter or esc it pops up again. So I’m stuck in it. Background still looks like I’m in the block environment. I’m not sure what to do about it. I’ll just force exit and hope that it saved the changes.