diff --git a/Assets/Mirror/Transports/KCP/KcpTransport.cs b/Assets/Mirror/Transports/KCP/KcpTransport.cs
index 2be24af8a..b72e14835 100644
--- a/Assets/Mirror/Transports/KCP/KcpTransport.cs
+++ b/Assets/Mirror/Transports/KCP/KcpTransport.cs
@@ -116,7 +116,7 @@ protected virtual void Awake()
                 () => OnClientConnected.Invoke(),
                 (message, channel) => OnClientDataReceived.Invoke(message, FromKcpChannel(channel)),
                 () => OnClientDisconnected?.Invoke(), // may be null in StopHost(): https://github.com/MirrorNetworking/Mirror/issues/3708
-                (error, reason) => OnClientError.Invoke(ToTransportError(error), reason),
+                (error, reason) => OnClientError?.Invoke(ToTransportError(error), reason), // may be null during shutdown: https://github.com/MirrorNetworking/Mirror/issues/3876
                 config
             );