I just tried to let spartacut check if there are updates for sidebar plugins. After clicking on "New versions of sidebar plugins" the XML file could be fetched correctly. But after the corresponding info messages the following PHP error was displayed:
After looking into the PHP code, I think that the array element "$subtree['children']", which is used as the argument of foreach(), isn't an array. So this should be checked before running the loop.Warning: Invalid argument supplied for foreach() in /[...]/plugins/serendipity_event_spartacus/serendipity_event_spartacus.php on line 734
Strangely enough this error could not be reproduced up to now. So it might be difficult to find the reason which cause this error. Nevertheless I think it would make sense to fix this issue.
Regards,
Pascal