diff --git a/QSB/EchoesOfTheEye/LightSensorSync/Messages/IlluminatedByMessage.cs b/QSB/EchoesOfTheEye/LightSensorSync/Messages/IlluminatedByMessage.cs
index d9cdcfc8..f8e63cc7 100644
--- a/QSB/EchoesOfTheEye/LightSensorSync/Messages/IlluminatedByMessage.cs
+++ b/QSB/EchoesOfTheEye/LightSensorSync/Messages/IlluminatedByMessage.cs
@@ -13,12 +13,12 @@ internal class IlluminatedByMessage : QSBWorldObjectMessage<QSBLightSensor, uint
 
 	public override void OnReceiveRemote()
 	{
-		foreach (var added in Data.Except(WorldObject._illuminatedBy))
+		foreach (var added in Data.Except(WorldObject._illuminatedBy).ToList())
 		{
 			WorldObject.SetIlluminated(added, true);
 		}
 
-		foreach (var removed in WorldObject._illuminatedBy.Except(Data))
+		foreach (var removed in WorldObject._illuminatedBy.Except(Data).ToList())
 		{
 			WorldObject.SetIlluminated(removed, false);
 		}
diff --git a/QSB/EchoesOfTheEye/LightSensorSync/Messages/PlayerIlluminatedByMessage.cs b/QSB/EchoesOfTheEye/LightSensorSync/Messages/PlayerIlluminatedByMessage.cs
index a86b0cba..1cbc1bd1 100644
--- a/QSB/EchoesOfTheEye/LightSensorSync/Messages/PlayerIlluminatedByMessage.cs
+++ b/QSB/EchoesOfTheEye/LightSensorSync/Messages/PlayerIlluminatedByMessage.cs
@@ -15,12 +15,12 @@ internal class PlayerIlluminatedByMessage : QSBMessage<(uint playerId, uint[] il
 	{
 		var qsbPlayerLightSensor = QSBPlayerManager.GetPlayer(Data.playerId).QSBPlayerLightSensor;
 
-		foreach (var added in Data.illuminatedBy.Except(qsbPlayerLightSensor._illuminatedBy))
+		foreach (var added in Data.illuminatedBy.Except(qsbPlayerLightSensor._illuminatedBy).ToList())
 		{
 			qsbPlayerLightSensor.SetIlluminated(added, true);
 		}
 
-		foreach (var removed in qsbPlayerLightSensor._illuminatedBy.Except(Data.illuminatedBy))
+		foreach (var removed in qsbPlayerLightSensor._illuminatedBy.Except(Data.illuminatedBy).ToList())
 		{
 			qsbPlayerLightSensor.SetIlluminated(removed, false);
 		}