diff --git a/action.yml b/action.yml
index 871231929..161a29219 100644
--- a/action.yml
+++ b/action.yml
@@ -179,7 +179,7 @@ runs:
     - name: Override branch for forks
       shell: bash
       run: |
-        if [ -z "$CC_BRANCH" ] && [ -z "$CC_TOKEN" ] && [ "${GITHUB_EVENT_PULL_REQUEST_REPO_FULL_NAME}" != "$GITHUB_REPOSITORY" ];
+        if [ -z "$CC_BRANCH" ] && [ -z "$CC_TOKEN" ] && [ -n "$GITHUB_EVENT_PULL_REQUEST_REPO_FULL_NAME"] && [ "${GITHUB_EVENT_PULL_REQUEST_REPO_FULL_NAME}" != "$GITHUB_REPOSITORY" ];
         then
           echo -e "\033[0;32m==>\033[0m Fork detected, tokenless uploading used"
           TOKENLESS="$GITHUB_EVENT_PULL_REQUEST_HEAD_LABEL"