One of the steps in creating new groups, is to select a parent group.
For this step, the plugin generates a combo box with all the active groups.
The issue I came across was that by having a large number of groups, it increased the loading time (probably because of a large query result, and code looping through the result), causing this script to break/time out, and display a blank page.
As a temporary workaround, I commented out the code that gets all the groups; instead I only display two options in the combo box: 'Site Root' option, and the parent group if there is one.
If you have any suggestion on how should I address this issue, I would appreciate it.