Conflict with "disabling" devel modules?

The autocomplete field doesn't seem to work when the devel modules are turned on...

More importantly, when you "disable devel modules" the next page load (and every subsequent one) throws this error to the screen:

Call to undefined function devel_themer_catch_function() in C:\**sitepath**\sites\all\modules\finder\modules\finder_autocomplete\finder_autocomplete.module on line 277

I got rid of the error one time, but to be honest I don't know how I did...

I think the problem is with this (from finder_autocomplete.module):

/**
 * Implementation of hook_theme_registry_alter().
 */
function finder_autocomplete_theme_registry_alter(&$theme_registry) {
  $theme_textfield = $theme_registry['textfield']['function'];
  if ($theme_textfield != 'theme_textfield') {
    variable_set('finder_autocomplete_textfield_theme', $theme_textfield);
  }
  $theme_registry['textfield']['function'] = $theme_registry['finder_autocomplete_textfield']['function'];
}