diff --git a/packages/netlify-cms-backend-git-gateway/src/implementation.js b/packages/netlify-cms-backend-git-gateway/src/implementation.js
index 808ac02c..b3df433b 100644
--- a/packages/netlify-cms-backend-git-gateway/src/implementation.js
+++ b/packages/netlify-cms-backend-git-gateway/src/implementation.js
@@ -413,7 +413,10 @@ export default class GitGateway {
     return this.backend.unpublishedEntries();
   }
   unpublishedEntry(collection, slug) {
-    return this.backend.unpublishedEntry(collection, slug);
+    return (
+      (this.backend.unpublishedEntry && this.backend.unpublishedEntry(collection, slug)) ||
+      Promise.resolve(false)
+    );
   }
   updateUnpublishedEntryStatus(collection, slug, newStatus) {
     return this.backend.updateUnpublishedEntryStatus(collection, slug, newStatus);