diff --git a/frontend/src/services/api.js b/frontend/src/services/api.js
index 176f50c..2ed5c62 100644
--- a/frontend/src/services/api.js
+++ b/frontend/src/services/api.js
@@ -475,7 +475,8 @@ export const adminAPI = {
     if (category) params.append('category', category);
     if (username) params.append('username', username);
     if (userId) params.append('userId', String(userId));
-    if (success !== undefined) params.append('success', String(success));
+    // Only send success if it's not empty string (to avoid filtering to false when user wants all logs)
+    if (success !== undefined && success !== '') params.append('success', String(success));
     params.append('limit', String(limit));
     params.append('offset', String(offset));