diff --git a/.travis.yml b/.travis.yml
index 293619f2..1f19d644 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,6 +20,7 @@ before_install: true
 matrix:
   allow_failures:
     - php: nightly
+    - 7.4snapshot
 
 install:
   - wget http://ftp.gnu.org/gnu/parallel/parallel-20170822.tar.bz2
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index b6e88de4..97f7d333 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -3590,7 +3590,9 @@ class SSH2
                     // on windows this returns a "Warning: Invalid CRT parameters detected" error
                     if (!@stream_select($read, $write, $except, $sec, $usec) && !count($read)) {
                         $this->is_timeout = true;
-                        $this->close_channel($client_channel);
+                        if ($client_channel == self::CHANNEL_EXEC && !$this->request_pty) {
+                            $this->close_channel($client_channel);
+                        }
                         return true;
                     }
                     $elapsed = microtime(true) - $start;
@@ -3623,7 +3625,7 @@ class SSH2
                 switch ($type) {
                     case NET_SSH2_MSG_CHANNEL_EXTENDED_DATA:
                         /*
-                        if ($client_channel == NET_SSH2_CHANNEL_EXEC) {
+                        if ($client_channel == self::CHANNEL_EXEC) {
                             $this->send_channel_packet($client_channel, chr(0));
                         }
                         */