diff --git a/docs/set-solana-release-tag.sh b/docs/set-solana-release-tag.sh
index ea4f7c764d..e795c4cd40 100755
--- a/docs/set-solana-release-tag.sh
+++ b/docs/set-solana-release-tag.sh
@@ -13,6 +13,11 @@ else
   )
 fi
 
+if [[ -z "$LATEST_SOLANA_RELEASE_VERSION" ]]; then
+  echo Error: release version not defined
+  exit 1
+fi
+
 set -x
 find html/ -name \*.html -exec sed -i "s/LATEST_SOLANA_RELEASE_VERSION/$LATEST_SOLANA_RELEASE_VERSION/g" {} \;
 if [[ -n $CI ]]; then