diff --git a/update.sh b/update.sh
index eed2bf3..b3e52b9 100644
--- a/update.sh
+++ b/update.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
-if [ -n "$1" ]; then
-else
+if ! [ -n "$1" ]; then
   echo "Enter new version"
+  exit 1
 fi
 
 cd /