I upgraded my tiki from 15.4 to 16.2. Everything runs fine. The problem is the site registration does not work. I have a tracker to extend my user information. In the tracker, I created a field called "Network" that allows the users to choose a group that them want to be in. Hence, they won't see each other content due to different group permission. This registration broke. The error message showed:
Cannot add nonexistent user xxx to group students
I found out the problem was that there is a change in trackerlib.php line 3671. Instead of returning "null", it now returns an empty array().
else {
return array();
}
In GroupSelector.php, line 124, the condition check
if (empty ($creators))) $creators=array($user);
This if will never be executed since the function now return an array not null. Hence causing the problem that no one can be registered if they choose a group in the registration form.
Propose solution, change the if condition in line 124 to:
if (empty($creators[0]))
