From 301959f8fcdcee444d2bee0281941aef150fdab1 Mon Sep 17 00:00:00 2001
From: Dragory <2606411+Dragory@users.noreply.github.com>
Date: Tue, 30 Apr 2019 06:58:38 +0300
Subject: [PATCH] Handle reaction roles for an unknown message gracefully

---
 src/plugins/ReactionRoles.ts | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/plugins/ReactionRoles.ts b/src/plugins/ReactionRoles.ts
index 4fcceb19..04cbd6e3 100644
--- a/src/plugins/ReactionRoles.ts
+++ b/src/plugins/ReactionRoles.ts
@@ -7,6 +7,7 @@ import { GuildSavedMessages } from "../data/GuildSavedMessages";
 import { Queue } from "../Queue";
 import { ReactionRole } from "../data/entities/ReactionRole";
 import Timeout = NodeJS.Timeout;
+import DiscordRESTError from "eris/lib/errors/DiscordRESTError"; // tslint:disable-line
 
 type ReactionRolePair = [string, string, string?];
 
@@ -120,7 +121,18 @@ export class ReactionRolesPlugin extends ZeppelinPlugin<IReactionRolesPluginConf
    */
   async applyReactionRoleReactionsToMessage(channelId: string, messageId: string, reactionRoles: ReactionRole[]) {
     const channel = this.guild.channels.get(channelId) as TextChannel;
-    const targetMessage = await channel.getMessage(messageId);
+
+    let targetMessage;
+    try {
+      targetMessage = await channel.getMessage(messageId);
+    } catch (e) {
+      if (e instanceof DiscordRESTError) {
+        logger.warn(`Reaction roles for unknown message ${messageId} in guild ${this.guild.name} (${this.guildId})`);
+        return;
+      } else {
+        throw e;
+      }
+    }
 
     // Remove old reactions, if any
     const removeSleep = sleep(1250);