diff --git a/.gitea/workflows/sync.yml b/.gitea/workflows/sync.yml
index 11be654..7af0a4a 100644
--- a/.gitea/workflows/sync.yml
+++ b/.gitea/workflows/sync.yml
@@ -27,7 +27,19 @@ jobs:
         ls -lh
         cp -r /home/steam/Steam/steamapps/workshop/content/394360/2249768662 src
         rm -rf src/.git
+    - name: check diff
+      id: check_changes
+      run: |
+        ls -lh
+        cd azurlane-tj
+        ls -lh
+        if [ -z "$(git status --porcelain)" ]; then
+          echo "::set-output name=has_changes::false"
+        else
+          echo "::set-output name=has_changes::true"
+        fi
     - name: commit and push
+      if: ${{ steps.check_changes.outputs.has_changes == 'true' }}
       run: |
         ls -lh
         cd azurlane-tj