Catchable fatal error

I get this error on the Joomla site after installing and linking Shop menu tab to the Hikari module using Product / Show:

Catchable fatal error: Object of class JParameter could not be converted to string in /home/mypointo/public_html/libraries/joomla/html/parameter.php on line 105

Hi,

We cannot reproduce the problem on our test websites. In order to correct the problem rapidly, would it be possible for you to send us an FTP access to your website and the URL of the page where you have that problem ?
Otherwise, we will have to ask you to put traces in that file and test the results for us, etc