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[Cecilia Vela Gurovic <1741814@xxxxxxxxxxxxxxxxxx>]

It looks like it is a php 7.1 issue.

The line that is throwing the error is trying to do an arithmetic
operation on a string that it's not a number:

$offset = (int)($offset / $groupsperpage) * $groupsperpage;

where $offset='all'

And according to the php documentation, with 7.1 we will receive these
warnings when performing an arithmetic operation trying to coerse
invalid strings:

http://php.net/manual/en/migration71.other-changes.php

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https://bugs.launchpad.net/bugs/1741814

Title:
  error when navigating to My groups page

Status in Mahara:
  New

Bug description:
  This may be related to PHP 7.1 as it seems to be peculiar to my
  system. But on the current master branch when I choose Groups from the
  main menu, I see an error and a call stack. It doesn't seem to cause
  any other problems.

  I looked into it and found that the code is trying to divide the word
  'all' by 10, hence the error, but I'm not sure why this is.

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