bsub & tmux : does not always reconnect to same session

I have created a shortcut in my KDE environment that performs the following command : bsub -q gui konsole -e tmux -Asmain It creates a konsole and automatically open a tmux session named main . The point is that when I activate this shortcut multiple time : sometimes it manages to reconnect to the existing main session, and sometimes it creates a new session named also main. Even though the machine selected by bsub is the same. Is there a way to enforce the usage of one single session created by tmux ?