diff --git a/cpp/utils.cc b/cpp/utils.cc
index d9c98d0..1159db2 100644
--- a/cpp/utils.cc
+++ b/cpp/utils.cc
@@ -103,6 +103,9 @@ namespace f8
 
             if (field_desc->is_repeated()) {
                 std::shared_ptr<a8::XObject> repeated_field = jsonobj.At(field_name);
+                if (!repeated_field) {
+                    continue;
+                }
                 for (int i = 0; i < repeated_field->Size(); ++i) {
                     auto field_value = repeated_field->At(i);
                     switch (field_desc->cpp_type()) {