diff --git a/app/lib/services/restApi.ts b/app/lib/services/restApi.ts
index c58d7d3b..04531805 100644
--- a/app/lib/services/restApi.ts
+++ b/app/lib/services/restApi.ts
@@ -688,7 +688,7 @@ export const runSlashCommand = (command: string, roomId: string, params: string,
 		roomId,
 		params,
 		triggerId,
-		tmid
+		...(tmid && { tmid })
 	});
 
 export const getCommandPreview = (command: string, roomId: string, params: string) =>