Major bug -User meta table gets deleted when we go to fields section

Please note that if you are using this plugin to save user data as well as usermeta then know this that you are in a big trouble.Just try creating a user with custom fields and then just click on the fields section in the registration form in the settings and you will know what i am talking about.
“Your usermeta is gone from the database”
I faced this issue and i struggled a lot so i want to rescue all others by giving the solution.
Go to fields-table.class.php and remove the delete function as it is removing the usermeta as well

global $wpdb;
  if($dnonce)
 $wpdb->delete( $wpdb->usermeta, array('meta_key'=>$field['key']), $where_format = null );

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