From a48a58bd3cac42e0a327c5c1c60db21682785097 Mon Sep 17 00:00:00 2001
From: Miikka Virtanen <2606411+Dragory@users.noreply.github.com>
Date: Wed, 14 Aug 2019 10:55:34 +0300
Subject: [PATCH] Fix error when calling resolveUserId with null/missing user
 id

---
 src/utils.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/utils.ts b/src/utils.ts
index 1cfdfe8b..643322c1 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -622,6 +622,10 @@ const unknownUsers = new Set();
 const unknownMembers = new Set();
 
 export function resolveUserId(bot: Client, value: string) {
+  if (value == null) {
+    return null;
+  }
+
   // A user mention?
   const mentionMatch = value.match(/^<@!?(\d+)>$/);
   if (mentionMatch) {