diff --git a/deploy.sh b/deploy.sh
index 60ebe22..4a1dfc2 100755
--- a/deploy.sh
+++ b/deploy.sh
@@ -5,7 +5,7 @@ set -euo pipefail
 # SAQEL PLATFORM - DEPLOY & GIT SYNCHRONIZATION SCRIPT
 # ==============================================================================
 
-if [ -n "$1" ]; then
+if [ -n "${1:-}" ]; then
   COMMIT_MSG="$1"
 else
   COMMIT_MSG="Update Saqel Platform: $(date +'%Y-%m-%d %H:%M:%S')"