diff --git a/OpenRA.Mods.Common/Widgets/Logic/MissionBrowserLogic.cs b/OpenRA.Mods.Common/Widgets/Logic/MissionBrowserLogic.cs
index 379aa0fea8..72e245d581 100644
--- a/OpenRA.Mods.Common/Widgets/Logic/MissionBrowserLogic.cs
+++ b/OpenRA.Mods.Common/Widgets/Logic/MissionBrowserLogic.cs
@@ -374,11 +374,12 @@ namespace OpenRA.Mods.Common.Widgets.Logic
 			if (selectedMap.InvalidCustomRules)
 				return;
 
-			var orders = new[] {
-				Order.Command("option gamespeed {0}".F(gameSpeed)),
-				Order.Command("option difficulty {0}".F(difficulty)),
-				Order.Command("state {0}".F(Session.ClientState.Ready))
-			};
+			var orders = new List<Order>();
+			if (difficulty != null)
+				orders.Add(Order.Command("option difficulty {0}".F(difficulty)));
+
+			orders.Add(Order.Command("option gamespeed {0}".F(gameSpeed)));
+			orders.Add(Order.Command("state {0}".F(Session.ClientState.Ready)));
 
 			var missionData = selectedMap.Rules.Actors["world"].TraitInfoOrDefault<MissionDataInfo>();
 			if (missionData != null && missionData.StartVideo != null && modData.DefaultFileSystem.Exists(missionData.StartVideo))