diff --git a/vllm-v0.6.2/vllm/model_executor/models/mpt.py b/vllm-v0.6.2/vllm/model_executor/models/mpt.py
index e15c0fe..cfa020d 100644
--- a/vllm-v0.6.2/vllm/model_executor/models/mpt.py
+++ b/vllm-v0.6.2/vllm/model_executor/models/mpt.py
@@ -272,7 +272,7 @@ class MPTForCausalLM(nn.Module, SupportsPP):
         config = vllm_config.model_config.hf_config
         quant_config = vllm_config.quant_config
         self.config = config
-        assert config.tie_word_embeddings
+        assert getattr(config, "tie_word_embeddings", True)
         self.quant_config = quant_config
 
         self.transformer = MPTModel(vllm_config=vllm_config,