diff --git a/telemetry.py b/telemetry.py
index 0ba1fdd..f68a1d1 100644
--- a/telemetry.py
+++ b/telemetry.py
@@ -93,6 +93,17 @@ def main(argv: Optional[List[str]] = None) -> int:
         return run(backend, device, args.interval)
     except KeyboardInterrupt:
         return 0
+    except BrokenPipeError:
+        # 读端先走（管给 head，或 campaign 结束时收掉）。这是正常终止，不该在
+        # telemetry.err 里留一段 traceback 让人以为遥测本身坏了。按 CPython 的
+        # 惯用做法把 stdout 指到 devnull——只吞异常不够，解释器退出时还会 flush
+        # 一次，再抛一条 "Exception ignored" 到 stderr。
+        try:
+            devnull = os.open(os.devnull, os.O_WRONLY)
+            os.dup2(devnull, sys.stdout.fileno())
+        except Exception:
+            pass
+        return 0
 
 
 if __name__ == "__main__":