diff --git a/command.go b/command.go
index f513ed4..eba1d42 100644
--- a/command.go
+++ b/command.go
@@ -56,6 +56,9 @@ func registerCommand(command Command) {
 		command.Trigger = strings.ToLower(command.Trigger)
 	}
 	command.UsersOnCooldown = mapset.NewSet()
+	if command.AllowedChannels == nil {
+		command.AllowedChannels = mapset.NewSet()
+	}
 	commands = append(commands, &command)
 }
 
@@ -164,7 +167,9 @@ func commandAllowed(session *discordgo.Session, message *discordgo.MessageCreate
 	}
 	// no allowed channels = all channels are allowed.
 	// DMs are whitelisted by default
-	if command.AllowedChannels.Cardinality() != 0 && !command.AllowedChannels.Contains(message.ChannelID) && !isDM(session, message) {
+	if command.AllowedChannels.Cardinality() != 0 &&
+		!command.AllowedChannels.Contains(message.ChannelID) &&
+		isDM(session, message) {
 		return false
 	}
 	return true