diff --git a/src/sofa/pbrpc/pbjson.cc b/src/sofa/pbrpc/pbjson.cc
index 341a907..3373938 100644
--- a/src/sofa/pbrpc/pbjson.cc
+++ b/src/sofa/pbrpc/pbjson.cc
@@ -204,8 +204,10 @@ static rapidjson::Value* field2json(const Message *msg, const FieldDescriptor *f
                 {
                     const Message *value = &(ref->GetRepeatedMessage(*msg, field, i));
                     rapidjson::Value* v = parse_msg(value, allocator);
-                    json->PushBack(*v, allocator);
-                    delete v;
+                    if (v){
+                        json->PushBack(*v, allocator);
+                        delete v;
+                    }
                 }
             }
             else