diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py b/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py
index c3a03f2e1..d2605c072 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py
@@ -999,6 +999,7 @@ def main():
     model.device = device
     model.unk_id = params.unk_id
 
+    G = None
     if "fast_beam_search" in params.decoding_method:
         if params.decoding_method == "fast_beam_search_nbest_LG":
             lexicon = Lexicon(params.lang_dir)