diff --git a/.github/workflows/kotlin_ci.yml b/.github/workflows/kotlin_ci.yml
index 0e52b2bc..c56dc451 100644
--- a/.github/workflows/kotlin_ci.yml
+++ b/.github/workflows/kotlin_ci.yml
@@ -18,6 +18,7 @@ jobs:
     - name: Fetch all branches
       run: git fetch origin
     - name: Merge head branch into main
+      if: github.event_name == 'pull_request'
       run: git merge origin/${{ github.event.pull_request.head.ref }}
     - name: set up JDK 17
       uses: actions/setup-java@v3