diff --git a/src/Tgstation.Server.Host/Components/Session/SessionController.cs b/src/Tgstation.Server.Host/Components/Session/SessionController.cs
index 452c4fefec..0f76b5993f 100644
--- a/src/Tgstation.Server.Host/Components/Session/SessionController.cs
+++ b/src/Tgstation.Server.Host/Components/Session/SessionController.cs
@@ -316,9 +316,20 @@ namespace Tgstation.Server.Host.Components.Session
 						if (parameters.ChatMessage.Text == null)
 							return Error("Missing message field in chatMessage!");
 
+						var anyFailed = false;
+						var parsedChannels = parameters.ChatMessage.ChannelIds.Select(
+							channelString =>
+							{
+								anyFailed |= !UInt64.TryParse(channelString, out var channelId);
+								return channelId;
+							});
+
+						if (anyFailed)
+							return Error("Failed to parse channelIds as U64!");
+
 						chat.QueueMessage(
 							parameters.ChatMessage,
-							parameters.ChatMessage.ChannelIds.Select(UInt64.Parse));
+							parsedChannels);
 						break;
 					case BridgeCommandType.Prime:
 						var oldPrimeTcs = primeTcs;