From eecb31ac9a55b6d60a0d5f956375b35a7a5c0363 Mon Sep 17 00:00:00 2001
From: Andris Reinman <andris@reinman.eu>
Date: Thu, 4 Jan 2024 10:38:13 +0200
Subject: [PATCH] fix(pop3): if connection is closed during authentication,
 then do not process the response. Fixes #596

---
 lib/pop3/connection.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/pop3/connection.js b/lib/pop3/connection.js
index b553b73a..9b7ba5a1 100644
--- a/lib/pop3/connection.js
+++ b/lib/pop3/connection.js
@@ -390,6 +390,11 @@ class POP3Connection extends EventEmitter {
             },
             this.session,
             (err, response) => {
+                if (!this.session) {
+                    // already closed, do nothing
+                    return;
+                }
+
                 if (err) {
                     this.logger.info(
                         {
@@ -438,6 +443,7 @@ class POP3Connection extends EventEmitter {
                     username,
                     'USER'
                 );
+
                 this.session.user = response.user;
 
                 this.openMailbox(err => {