diff --git a/api/v2/memo_service.go b/api/v2/memo_service.go
index 9924ae13..6310d8af 100644
--- a/api/v2/memo_service.go
+++ b/api/v2/memo_service.go
@@ -200,7 +200,11 @@ func parseListMemosFilter(expression string) (*ListMemosFilter, error) {
 		return nil, errors.Errorf("found issue %v", issues)
 	}
 	filter := &ListMemosFilter{}
-	callExpr := ast.Expr().GetCallExpr()
+	expr, err := cel.AstToParsedExpr(ast)
+	if err != nil {
+		return nil, err
+	}
+	callExpr := expr.GetExpr().GetCallExpr()
 	findField(callExpr, filter)
 	return filter, nil
 }
diff --git a/proto/store/activity.proto b/proto/store/activity.proto
index 1e4ab177..5990f042 100644
--- a/proto/store/activity.proto
+++ b/proto/store/activity.proto
@@ -3,9 +3,3 @@ syntax = "proto3";
 package memos.store;
 
 option go_package = "gen/store";
-
-message ActivityMemoCommentCreatePayload {
-  int32 memo_id = 1;
-  int32 user_id = 2;
-  int32 
-}