Yep, I got that one too.
I fixed it by actually just commenting out some lines of code in the file:
.../public_html/modules/mod_gj_mygroups/mod_gj_mygroups.php
Opne the file: mod_gj_mygroups.php in an editor and comment out the following code:
// $database->setQuery("SELECT nophoto_logo FROM #__gj_options");
// if (!$result=$database->query()) {
// echo $database->stderr();
// return;
// }
// define('DEFAULT_LOGO', $database->loadResult());
// global $mosConfig_offset, $my;
The "//" meens that the line is commented out. To un-comment again later just remove the "//" again.
I haven't experienced any negative consequences yet as a result of commenting the code out. And the module works. So for me it does the job. If it later should show, that is has consequences, then it is easy to uncomment again. So, DONT delete the code, JUST uncomment

M