diff --git a/.github/workflows/tf_update.yml b/.github/workflows/tf_update.yml
index 28c2136..66b5181 100644
--- a/.github/workflows/tf_update.yml
+++ b/.github/workflows/tf_update.yml
@@ -20,4 +20,4 @@ jobs:
           git log -1
           git pull
           name=$(basename "$PWD")
-          if [ -z $(tmux list-sessions | grep $name | awk '{ print $1 }') ]; then tmux new-session -d -s $name 'bash run.sh' ; else tmux kill-session -t $name ; tmux new-session -d -s $name 'bash run.sh' ; fi
+          if [ -z $(tmux list-sessions | grep $name | awk '{ print $1 }') > /dev/null 2>&1 ]; then tmux new-session -d -s $name 'bash run.sh' ; else tmux kill-session -t $name ; tmux new-session -d -s $name 'bash run.sh' ; fi