diff --git a/.github/workflows/sonarqube.yaml b/.github/workflows/sonarqube.yaml
index 5db94de..759cce9 100644
--- a/.github/workflows/sonarqube.yaml
+++ b/.github/workflows/sonarqube.yaml
@@ -45,7 +45,7 @@ jobs:
 
     - name: Check if PR is from a fork
       id: check_fork
-      if: ${{ github.event.pull_request.head.repo.full_name != 'dtcenter/METdataio' }}
+      if: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.repo.full_name != 'dtcenter/METdataio' }}
       run: echo "SonarQube scan cannot be run from a fork"; exit 1
     - uses: actions/checkout@v4
       with: