diff --git a/paddlespeech/t2s/frontend/phonectic.py b/paddlespeech/t2s/frontend/phonectic.py
index 873aa359..261db80a 100644
--- a/paddlespeech/t2s/frontend/phonectic.py
+++ b/paddlespeech/t2s/frontend/phonectic.py
@@ -101,7 +101,8 @@ class English(Phonetics):
                 if (phn in self.vocab_phones and phn not in self.punc) else "sp"
                 for phn in phones
             ]
-            phones_list.append(phones)
+            if len(phones) != 0:
+                phones_list.append(phones)
 
         if merge_sentences:
             merge_list = sum(phones_list, [])