diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 7327d01..7fcd8a2 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -46,6 +46,7 @@ jobs:
           git log -"5" --format="- %H %s" | sed '/^$/d' >> ReleaseNotes.md
 
       - name: Delete Old Prerelease
+        if: env.OLD_PRE_TAG != "NULL"
         uses: dev-drprasad/delete-tag-and-release@v0.2.0
         with:
           tag_name: ${{ env.OLD_PRE_TAG }}