Notice: Undefined index: alias in path_node_insert() line 188 of path.module

Version: Drupal7

This notice may appear after using Pathauto module:
Notice: Undefined index: alias in path_node_insert() (line 188 of / modules/path/path.module

Just open :modules/path/path.module
 

and replace line 188
$path['alias'] = trim($path['alias']);

with:

    if (!empty($path['alias']))  $path['alias'] = trim($path['alias']);

Also 
change line 205

    $path['alias'] = trim($path['alias']);

to

    if (!empty($path['alias']))  $path['alias'] = trim($path['alias']);