Unknown variable when synchronizing on membership status change

Consistently receive an error on login to Drupal:

"Notice: Undefined variable: op in civicrm_member_roles_sync_user() (line 111 of/var/www/fdby/sites/all/modules/civicrm/drupal/modules/civicrm_member_roles/civicrm_member_roles.module)."

In the stated file, the method at line 111 is called from the Drupal hook on login and reads:

function civicrm_member_roles_sync_user($account) {
104 if (!civicrm_initialize())

{ 105 return; 106 }

107 if (variable_get('civicrm_member_roles_sync_method', 0) == 0)

{ 108 _civicrm_member_roles_sync($account->uid); 109 }

110 if (variable_get('civicrm_member_roles_sync_method', 0) == 3) {
111 if ($op == 'insert')

{ 112 _civicrm_member_roles_sync($account->uid); 113 }

114 }
115 }

This looks like it might be a copy-and-paste error from the method at the bottom of the file "civicrm_member_roles_civicrm_post", which does h ave a variable "$op", presumably used to gauge the type of operation happening during the membership status change.

I don't really know enough about the inner workings of Civi to propose a solution. I am going to comment out the check, and syncs will happen at login and logout, and on membership changes, which is fine with me in my situation.