diff --git a/wekws/bin/stream_kws_ctc.py b/wekws/bin/stream_kws_ctc.py
index fbc6584..66251fd 100644
--- a/wekws/bin/stream_kws_ctc.py
+++ b/wekws/bin/stream_kws_ctc.py
@@ -485,7 +485,7 @@ class KeyWordSpotter(torch.nn.Module):
         # For streaming kws, the cur_hyps should be reset if the time of
         # a possible keyword last over the max_frames value you set.
         # see this issue:https://github.com/duj12/kws_demo/issues/2
-        if len(self.cur_hyps[0][0]) > 0:
+        if len(self.cur_hyps) > 0 and len(self.cur_hyps[0][0]) > 0:
             keyword_may_start = int(self.cur_hyps[0][1][2][0]['frame'])
             if (self.total_frames - keyword_may_start) > self.max_frames:
                 self.reset()