diff --git a/tllm/commons/cache.py b/tllm/commons/cache.py
index d2f5af7..c2deebc 100644
--- a/tllm/commons/cache.py
+++ b/tllm/commons/cache.py
@@ -116,9 +116,9 @@ def build(self, seq_input: SeqInput, cache_manager: "CacheManager"):
                 # 命中了之前的 kv cache，使用历史 cache
                 if hit_uuid is not None and cache_manager.get(hit_uuid) is not None:
                     hid_decoder_cache: DecoderCache = copy.deepcopy(cache_manager.get(hit_uuid))
-                    # 相同请求时，避免过超过 cache 长度
+                    # 相同输入时，避免过超过 cache 长度
                     if q_len <= hit_cache_len:
-                        hit_cache_len = q_len - 1
+                        hit_cache_len = q_len - 2
 
                     hid_decoder_cache.truncate(hit_cache_len)
                     hid_decoder_cache.set_q_len(q_len - hit_cache_len)
diff --git a/tllm/engine.py b/tllm/engine.py
index 4d9ce89..f24196e 100644
--- a/tllm/engine.py
+++ b/tllm/engine.py
@@ -84,8 +84,16 @@ async def _generate(self):
 
                 # await asyncio.sleep(self.sleep_time)
             except asyncio.CancelledError:
-                self.logger.debug("CancelledError")
+                # LLM Generate Error or Server Cancel Engine
+                self.logger.error("CancelledError")
+                for request_data in request_data_list:
+                    request_data.is_stop = True
+                    request_data.finish_reason_list = ["Server Error"]
+                    async with request_data.condition:
+                        request_data.condition.notify()
+                traceback.print_exc()
             except Exception as e:
+                self.logger.error(f"Error input_ids: {'\n'.join(x.input_ids for x in request_data_list)}")
                 self.logger.error(f"Error processing prefill_queue data: {str(e)}")
                 traceback.print_exc()
             except BaseException as e:
diff --git a/tllm/grpc/master_service/worker_manager.py b/tllm/grpc/master_service/worker_manager.py
index 3e8f807..0a0cdc4 100644
--- a/tllm/grpc/master_service/worker_manager.py
+++ b/tllm/grpc/master_service/worker_manager.py
@@ -10,6 +10,9 @@
 from tllm.grpc.master_service.pending_requests import PendingRequests
 from tllm.grpc.proto import schemas_pb2, schemas_pb2_grpc
 from tllm.schemas import MIX_TENSOR, SeqInput
+from tllm.singleton_logger import SingletonLogger
+
+logger = SingletonLogger.setup_master_logger()
 
 
 async def rpc_image_forward(
@@ -107,6 +110,11 @@ async def forward(self, hidden_states: MIX_TENSOR, seq_input: SeqInput) -> Tuple
         try:
             output = await asyncio.wait_for(forward_future, timeout=PP_TIMEOUT)
         except asyncio.CancelledError:
+            logger.error("Client Timeout Error")
+            raise asyncio.CancelledError
+
+        if output.data == b"":
+            logger.error("Client Forward Error")
             raise asyncio.CancelledError
 
         return convertor.deserialize(output), await asyncio.wait_for(status_future, timeout=PP_TIMEOUT)
diff --git a/tllm/grpc/worker_service/worker_server.py b/tllm/grpc/worker_service/worker_server.py
index cc05422..5f24a44 100644
--- a/tllm/grpc/worker_service/worker_server.py
+++ b/tllm/grpc/worker_service/worker_server.py
@@ -75,6 +75,11 @@ async def stop(self):
                 pass
 
     async def forward_func(self, request: schemas_pb2.ForwardRequest):
+        # 如果收到为空，则直接返回
+        if request.hidden_states.data == b"":
+            if self.comm.is_rank0():
+                await self.master_rpc_manager.rpc_func(request, None, -1)
+            return
         s1 = time.perf_counter()
 
         convertor = Convertor()
@@ -85,7 +90,13 @@ async def forward_func(self, request: schemas_pb2.ForwardRequest):
         self.comm.debug_rank0(f"deserialize_tensor cost time: {time.perf_counter() - s1:.4f}")
 
         s1 = time.perf_counter()
-        output_hidden_states = self.model(hidden_states, seq_input)
+        try:
+            output_hidden_states = self.model(hidden_states, seq_input)
+        except ValueError as e:
+            self.logger.error(f"forward_func ValueError by {str(e)}")
+            if self.comm.is_rank0():
+                await self.master_rpc_manager.rpc_func(request, None, -1)
+            return
         cost_time = time.perf_counter() - s1
         self.comm.debug_rank0(f"forward cost time: {cost_time:.4f}")