diff --git a/app/repositories/report.py b/app/repositories/report.py
index 90bfb74..747c18b 100644
--- a/app/repositories/report.py
+++ b/app/repositories/report.py
@@ -49,7 +49,7 @@ class ReportRepository():
         report = await use_collection(TaskEnv.CLN_PROJECT).aggregate([
             {
                 '$group': {
-                    '_id': f"design.state",
+                    '_id': "$design.state",
                     'count': {'$sum': 1}
                 }
             }