diff --git a/tmux_ssh b/tmux_ssh
index 23adddc..3f1962f 100755
--- a/tmux_ssh
+++ b/tmux_ssh
@@ -1,13 +1,14 @@
 #!/bin/sh
 #
-SESSION=$(tmux ls -F "#{session_name}")
 
-echo $NEW
+for s in $(tmux list-sessions -F '#{session_name}'); do
+    p=$(tmux list-panes -F '#{pane_tty}' -t "$s")
+    if [ "$p" = "$(tty)" ]; then
+        # Session already running
+        exit 0
+    fi
+done
 
-if [ "$SESSION" = "" ]; then
-	tmux attach-session -t default_ssh || tmux new-session -s default_ssh
-else
-	echo tmux-session \"$SESSION\" already running.
-fi
+tmux attach-session -t default_ssh || tmux new-session -s default_ssh