diff --git a/funasr/models/llm_asr/tts_models/e2e_model.py b/funasr/models/llm_asr/tts_models/e2e_model.py
index 6ee922b96..59c65eed8 100644
--- a/funasr/models/llm_asr/tts_models/e2e_model.py
+++ b/funasr/models/llm_asr/tts_models/e2e_model.py
@@ -1004,6 +1004,8 @@ class UCTDXvecSlotModel(UpsampleCtcTokenDiffModel):
 
             # forward FM model
             set_all_random_seed(0)
+            if cur_token.shape[1] < 1:
+                return None, None
             feat = self.fm_model.inference(
                 cur_token, cur_token_len,
                 xvec, xvec_lengths,