diff --git a/model/provider/provider_openai_official.py b/model/provider/provider_openai_official.py
index ba32a7ed5..b4e0e634d 100644
--- a/model/provider/provider_openai_official.py
+++ b/model/provider/provider_openai_official.py
@@ -135,8 +135,9 @@ class ProviderOpenAIOfficial(Provider):
         
         # 使用 tictoken 截断消息
         _encoded_prompt = self.enc.encode(prompt)
-        prompt = self.enc.decode(_encoded_prompt[:self.openai_model_configs['max_tokens'] - 100])
-        gu.log(f"注意，有一部分 prompt 文本由于超出 token 限制而被截断。", level=gu.LEVEL_WARNING, max_len=300)
+        if self.openai_model_configs['max_tokens'] < len(_encoded_prompt):
+            prompt = self.enc.decode(_encoded_prompt[:self.openai_model_configs['max_tokens'] - 100])
+            gu.log(f"注意，有一部分 prompt 文本由于超出 token 限制而被截断。", level=gu.LEVEL_WARNING, max_len=300)
 
         cache_data_list, new_record, req = self.wrap(prompt, session_id, image_url)
         gu.log(f"CACHE_DATA_: {str(cache_data_list)}", level=gu.LEVEL_DEBUG, max_len=99999)