diff --git a/dist/index.js b/dist/index.js
index d3044cf..5bd54cc 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -9984,8 +9984,8 @@ function getJSON({ configPath, localConfigPath, remoteConfigURL, GitHubConfigOwn
             const url = new URL(remoteConfigURL);
             return yield downloadJSON(url);
         }
-        const is_same_repo = GitHubConfigOwner === context.repo.owner &&
-            GitHubConfigRepo === context.repo.repo;
+        const is_same_repo = (!GitHubConfigOwner || GitHubConfigOwner === context.repo.owner) &&
+            (!GitHubConfigRepo || GitHubConfigRepo === context.repo.repo);
         core.info(`Using config file ${GitHubConfigPath || configPath} from repo ${GitHubConfigOwner || context.repo.owner}/${GitHubConfigRepo || context.repo.repo} [ref: ${GitHubConfigRef ||
             (is_same_repo ? context.sha : "latest commit on the default branch")}]`);
         let _octokit = octokit;
diff --git a/index.ts b/index.ts
index 48d46ae..1916da0 100644
--- a/index.ts
+++ b/index.ts
@@ -176,8 +176,8 @@ async function getJSON({
   }
 
   const is_same_repo =
-    GitHubConfigOwner === context.repo.owner &&
-    GitHubConfigRepo === context.repo.repo;
+    (!GitHubConfigOwner || GitHubConfigOwner === context.repo.owner) &&
+    (!GitHubConfigRepo || GitHubConfigRepo === context.repo.repo);
 
   core.info(
     `Using config file ${GitHubConfigPath || configPath} from repo ${