diff --git a/Barotrauma/BarotraumaServer/Source/Networking/BanList.cs b/Barotrauma/BarotraumaServer/Source/Networking/BanList.cs
index 9103fee86..9f0a4b88c 100644
--- a/Barotrauma/BarotraumaServer/Source/Networking/BanList.cs
+++ b/Barotrauma/BarotraumaServer/Source/Networking/BanList.cs
@@ -163,7 +163,20 @@ namespace Barotrauma.Networking
                 expirationTime = DateTime.Now + duration.Value;
             }
 
-            bannedPlayers.Add(new BannedPlayer(name, ip, reason, expirationTime));
+            if (!string.IsNullOrEmpty(ip))
+            {
+                bannedPlayers.Add(new BannedPlayer(name, ip, reason, expirationTime));
+            }
+            else if (steamID > 0)
+            {
+                bannedPlayers.Add(new BannedPlayer(name, steamID, reason, expirationTime));
+            }
+            else
+            {
+                DebugConsole.ThrowError("Failed to ban a client (no valid IP or Steam ID given)");
+                return;
+            }
+
             Save();
         }