diff --git a/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs b/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs
index 65bab359de..b40c525ee2 100644
--- a/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs
+++ b/OpenRA.Mods.Common/UtilityCommands/UpgradeRules.cs
@@ -650,7 +650,7 @@ namespace OpenRA.Mods.Common.UtilityCommands
 					}
 					else
 					{
-						if (node.Key == "MaximumLaunchSpeed" && parent.Value.Value == "Missile")
+						if (node.Key == "MaximumLaunchSpeed" && parent != null && parent.Value.Value == "Missile")
 							node.Key = "Speed";
 					}
 				}