Bug#944778:
I am also experiencing this issue on tmux 3.1b-1. -Chris
Bug#944778: tmux: "Couldn't get a window index" error message
Package: tmux Version: 3.0~rc5-2 Severity: normal With prior versions bind-key C new-window -n ROOT -a -t 50 sudo su - works as expected; with this ~rc5 I need to remove the "-t 50" part, else I just get the error message in $SUBJECT. -- System Information: Debian Release: 10.0 APT pref