diff --git a/tools/export_utils.py b/tools/export_utils.py
index a357a4f39f7b1b1e50406ec3890caec32aa1a59c..48068b5e60519d7954c850a6d58bba77386914a0 100644
--- a/tools/export_utils.py
+++ b/tools/export_utils.py
@@ -109,7 +109,7 @@ def dump_infer_config(config, path, image_shape, model):
             'Architecture: {} is not supported for exporting model now'.format(
                 infer_arch))
         os._exit(0)
-    if 'mask_post_process' in model.__dict__:
+    if getattr(model.__dict__, 'mask_post_process', None):
         infer_cfg['mask_resolution'] = model.mask_post_process.mask_resolution
     infer_cfg['with_background'], infer_cfg['Preprocess'], infer_cfg[
         'label_list'], image_shape = parse_reader(