Warning: array_merge() [function.array-merge]: Argument #2 is not an array in user/plugins/route301/route301.plugin.php line 68

user/plugins/route301/route301.plugin.php line 68:
  array_merge( ...1 args... )
system/classes/controller.php line 167:
  Route301->act( ...1 arg... )
index.php line 227:
  Controller::dispatch_request( )