diff --git a/lib/irc.js b/lib/irc.js
index ff02c7e..2026798 100644
--- a/lib/irc.js
+++ b/lib/irc.js
@@ -252,6 +252,8 @@ export function isError(cmd) {
 	case ERR_SASLABORTED:
 	case ERR_SASLALREADY:
 		return true;
+	case "FAIL":
+		return true;
 	default:
 		return false;
 	}