diff --git a/OpenRA.Mods.Common/Traits/SupportPowers/GrantExternalConditionPower.cs b/OpenRA.Mods.Common/Traits/SupportPowers/GrantExternalConditionPower.cs
index 2978672ed3c1..c5f283087c78 100644
--- a/OpenRA.Mods.Common/Traits/SupportPowers/GrantExternalConditionPower.cs
+++ b/OpenRA.Mods.Common/Traits/SupportPowers/GrantExternalConditionPower.cs
@@ -51,7 +51,7 @@ public class GrantExternalConditionPowerInfo : SupportPowerInfo
 
 		public readonly string EffectImage = null;
 
-		[SequenceReference(nameof(EffectImage))]
+		[SequenceReference(nameof(EffectImage), allowNullImage: true)]
 		public readonly string EffectSequence = null;
 
 		[PaletteReference]