diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 6672369a..3c7a71e5 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -1936,7 +1936,7 @@ class SFTP extends SSH2
             case is_resource($data):
                 $mode = $mode & ~self::SOURCE_LOCAL_FILE;
                 $info = stream_get_meta_data($data);
-                if ($info['wrapper_type'] == 'PHP' && $info['stream_type'] == 'Input') {
+                if (isset($info['wrapper_type']) && $info['wrapper_type'] == 'PHP' && $info['stream_type'] == 'Input') {
                     $fp = fopen('php://memory', 'w+');
                     stream_copy_to_stream($data, $fp);
                     rewind($fp);