diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 436cb1c..88519dc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -70,6 +70,9 @@ jobs:
 
       - name: Login to DockerHub
         uses: docker/login-action@v1
+        env:
+          DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
+        if: ${{ env.DOCKERHUB_USERNAME != '' }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}