From d06071b8c592944b56a942402e492c9f4eddca0b Mon Sep 17 00:00:00 2001
From: titanism <101466223+titanism@users.noreply.github.com>
Date: Mon, 29 Jul 2024 03:42:50 -0500
Subject: [PATCH] fix: fixed callback invocations to check if session already
 closed (#705)

---
 lib/pop3/connection.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/lib/pop3/connection.js b/lib/pop3/connection.js
index 1e4b709c..d03aee95 100644
--- a/lib/pop3/connection.js
+++ b/lib/pop3/connection.js
@@ -727,6 +727,11 @@ class POP3Connection extends EventEmitter {
         }
 
         this._server.onFetchMessage(message, this.session, (err, stream) => {
+            if (!this.session) {
+                // already closed, do nothing
+                return;
+            }
+            
             if (err) {
                 this._server.loggelf({
                     short_message: '[POP3RETR] error',
@@ -810,6 +815,11 @@ class POP3Connection extends EventEmitter {
         }
 
         this._server.onFetchMessage(message, this.session, (err, stream) => {
+            if (!this.session) {
+                // already closed, do nothing
+                return;
+            }
+            
             if (err) {
                 this._server.loggelf({
                     short_message: '[POP3TOP] error',
@@ -1002,6 +1012,11 @@ class POP3Connection extends EventEmitter {
 
     openMailbox(next) {
         this._server.onListMessages(this.session, (err, listing) => {
+            if (!this.session) {
+                // already closed, do nothing
+                return;
+            }
+            
             if (err) {
                 this.logger.info(
                     {