diff --git a/packages/cli/src/commands/repo/fix.ts b/packages/cli/src/commands/repo/fix.ts
index 285dd75e3b..e7d243ea2c 100644
--- a/packages/cli/src/commands/repo/fix.ts
+++ b/packages/cli/src/commands/repo/fix.ts
@@ -302,11 +302,13 @@ export function fixPluginId(pkg: FixablePackage) {
     );
   }
 
-  pkg.packageJson.backstage = {
-    ...pkg.packageJson.backstage,
-    pluginId: guessedPluginId,
-  };
-  pkg.changed = true;
+  if (guessedPluginId) {
+    pkg.packageJson.backstage = {
+      ...pkg.packageJson.backstage,
+      pluginId: guessedPluginId,
+    };
+    pkg.changed = true;
+  }
 }
 
 const backendPluginPackageNameByPluginId = new Map(