We are using the module on a Drupal 7 site and ran into a problem where the entire node would not display (blank page) and a PHP error was generated "Fatal error: Unsupported operand types in /includes/theme.inc". We narrowed it down to a problem with the phone extension field and PHP 5.4. If there is data in the extension field node doesn't display. If no data in the field, node displays. The error does not occur on the server running PHP 5.3. On a duplicate server running PHP 5.4, the problem occurs. Also tried same troubleshooting on a local dev server, switching PHP versions and replicated the problem.

If you have any ideas on a fix or workaround, please let me know.

Thanks,
Tim