diff --git a/Assets/Mirror/Runtime/NetworkClient.cs b/Assets/Mirror/Runtime/NetworkClient.cs
index bbbf7e19d..a3f1db548 100644
--- a/Assets/Mirror/Runtime/NetworkClient.cs
+++ b/Assets/Mirror/Runtime/NetworkClient.cs
@@ -318,7 +318,8 @@ static bool UnpackAndInvoke(NetworkReader reader, int channelId)
             }
             else
             {
-                Debug.LogError("Invalid message header.");
+                // => WARNING, not error. can happen if attacker sends random data.
+                Debug.LogWarning("Invalid message header.");
                 // simply return false. caller is responsible for disconnecting.
                 //connection.Disconnect();
                 return false;
diff --git a/Assets/Mirror/Runtime/NetworkServer.cs b/Assets/Mirror/Runtime/NetworkServer.cs
index 371354292..ae04aa11f 100644
--- a/Assets/Mirror/Runtime/NetworkServer.cs
+++ b/Assets/Mirror/Runtime/NetworkServer.cs
@@ -451,7 +451,8 @@ static bool UnpackAndInvoke(NetworkConnectionToClient connection, NetworkReader
             }
             else
             {
-                Debug.LogError($"Invalid message header for connection: {connection}.");
+                // => WARNING, not error. can happen if attacker sends random data.
+                Debug.LogWarning($"Invalid message header for connection: {connection}.");
                 // simply return false. caller is responsible for disconnecting.
                 //connection.Disconnect();
                 return false;