diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 120b796d..f39e3786 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -4070,7 +4070,9 @@ class SSH2
         }
 
         $this->bitmap = 0;
-        fclose($this->fsock);
+        if (is_resource($this->fsock) && get_resource_type($this->fsock) == 'stream') {
+            fclose($this->fsock);
+        }
 
         return false;
     }