diff --git a/ktransformers/server/backend/interfaces/balance_serve.py b/ktransformers/server/backend/interfaces/balance_serve.py
index be48c92..aa6e436 100644
--- a/ktransformers/server/backend/interfaces/balance_serve.py
+++ b/ktransformers/server/backend/interfaces/balance_serve.py
@@ -368,6 +368,8 @@ class BalanceServeInterface(BackendInterfaceBase):
         stop_criteria =  [self.tokenizer.encode(self.tokenizer.eos_token, add_special_tokens=False),self.tokenizer.encode("<|im_end|>")]
         query_add.stop_criteria = stop_criteria
         query_add.sample_options.temperature = temperature
+        if top_p == 0:
+            top_p = 0.0001
         query_add.sample_options.top_p = top_p
         query_add.estimated_length = min(self.args.cache_lens, query_length+self.args.max_new_tokens)
         query_id = self.sched_client.add_query(query_add)
diff --git a/ktransformers/server/backend/interfaces/transformers.py b/ktransformers/server/backend/interfaces/transformers.py
index 1460176..d002435 100644
--- a/ktransformers/server/backend/interfaces/transformers.py
+++ b/ktransformers/server/backend/interfaces/transformers.py
@@ -208,6 +208,8 @@ class TransformersInterface(BackendInterfaceBase):
             temperature = self.model.generation_config.temperature
         if top_p is None:
             top_p = self.model.generation_config.top_p
+        if top_p == 0:
+            top_p = 0.0001
         generation_config, model_kwargs = self.model._prepare_generation_config(
             None, max_length=self.args.max_new_tokens,
             do_sample=True,