diff --git a/PluralKit.Bot/Commands/Checks.cs b/PluralKit.Bot/Commands/Checks.cs
index 0dd86fbd..362e6aca 100644
--- a/PluralKit.Bot/Commands/Checks.cs
+++ b/PluralKit.Bot/Commands/Checks.cs
@@ -230,6 +230,9 @@ public class Checks
         if (channel == null)
             throw new PKError("Unable to get the channel associated with this message.");
 
+        if (channel.GuildId == null)
+            throw new PKError("PluralKit is not able to proxy messages in DMs.");
+
         // using channel.GuildId here since _rest.GetMessage() doesn't return the GuildId
         var context = await ctx.Repository.GetMessageContext(msg.Author.Id, channel.GuildId.Value, msg.ChannelId);
         var members = (await ctx.Repository.GetProxyMembers(msg.Author.Id, channel.GuildId.Value)).ToList();