diff --git a/aps.sh b/aps.sh
index 9c26ae4..008fd62 100644
--- a/aps.sh
+++ b/aps.sh
@@ -197,6 +197,7 @@ main() {
         echo "[E] A lock file already exists."
         echo "    If you're sure no package manager is running,"
         echo "    remove the file ${AL_LOCK}"
+        exit 1
     fi
     touch "${AL_LOCK}"