diff --git a/fastNLP/modules/decoder/CRF.py b/fastNLP/modules/decoder/CRF.py
index cd68d35d..11cde48a 100644
--- a/fastNLP/modules/decoder/CRF.py
+++ b/fastNLP/modules/decoder/CRF.py
@@ -89,7 +89,7 @@ class ConditionalRandomField(nn.Module):
         score = score.sum(0) + emit_score[-1]
         if self.include_start_end_trans:
             st_scores = self.start_scores.view(1, -1).repeat(batch_size, 1)[batch_idx, tags[0]]
-            last_idx = masks.long().sum(0)
+            last_idx = mask.long().sum(0)
             ed_scores = self.end_scores.view(1, -1).repeat(batch_size, 1)[batch_idx, tags[last_idx, batch_idx]]
             score += st_scores + ed_scores
         # return [B,]
diff --git a/reproduction/Biaffine_parser/run.py b/reproduction/Biaffine_parser/run.py
index 45668066..209e45cb 100644
--- a/reproduction/Biaffine_parser/run.py
+++ b/reproduction/Biaffine_parser/run.py
@@ -352,7 +352,7 @@ if __name__ == "__main__":
     elif args.mode == 'test':
         test(args.path)
     elif args.mode == 'infer':
-        infer()
+        pass
     else:
         print('no mode specified for model!')
         parser.print_help()