diff --git a/lib/indexHelpers.js b/lib/indexHelpers.js
index 612dd41..a918ab2 100644
--- a/lib/indexHelpers.js
+++ b/lib/indexHelpers.js
@@ -160,7 +160,8 @@ const storeReadmeInJsonIfExists = (modulePath, currentExtendedPackageJson) => {
         typeof modulePath !== 'string' ||
         typeof currentExtendedPackageJson !== 'object' ||
         modulePath === '' ||
-        currentExtendedPackageJson?.readme?.toLowerCase()?.indexOf('no readme data found') === -1
+        (typeof currentExtendedPackageJson?.readme === 'string' &&
+            currentExtendedPackageJson?.readme?.toLowerCase()?.indexOf('no readme data found') === -1)
     ) {
         return;
     }