diff --git a/.github/workflows/build-deploy-cloudrun-function.yml b/.github/workflows/build-deploy-cloudrun-function.yml
index 874c1ef..62b9d82 100644
--- a/.github/workflows/build-deploy-cloudrun-function.yml
+++ b/.github/workflows/build-deploy-cloudrun-function.yml
@@ -46,6 +46,13 @@ jobs:
         id: build-number
         run: echo "build-number=$(git rev-parse --short=7 ${{ github.sha }})" >> $GITHUB_OUTPUT
 
+      - name: Verify Build Number
+        run: |
+          if [ -z "${{ steps.build-number.outputs.build-number }}" ]; then
+            echo "Build number is empty"
+            exit 1
+          fi      
+
   build-and-deploy:
     runs-on: ubuntu-latest
     needs: build-number