tmux exits with [exited] 1;2c on macOS catalina

Solution 1:

I encountered same problem for byobu.
I tried

pkill byobu..

not resolved...
Then I tried

pkill tmux 

and it solved the problem for me...
The problem might've been due to tmux upgrade which was earlier this morning...
tmux 3.1a -> 3.1b

Also check this link to another related answer.