diff --git a/packages/core/lib/utils/store/web.dart b/packages/core/lib/utils/store/web.dart
index a90b27e..59ea72c 100644
--- a/packages/core/lib/utils/store/web.dart
+++ b/packages/core/lib/utils/store/web.dart
@@ -89,6 +89,16 @@ class StoreImpl implements Store {
         }
       }
     }
+
+    if (anonymousId != null) {
+      try {
+        final decoded = json.decode(anonymousId);
+        if (decoded is String) {
+          anonymousId = decoded;
+        }
+      } catch (_) {}
+    }
+
     return anonymousId ?? '';
   }
 }