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[Robert Lyon <robertl@xxxxxxxxxxxxxxx>]

This might have been fixed by patch https://reviews.mahara.org/#/c/2621

Newer versions of php like to have objects created before adding things
to them.

So one can't do this: 
	$this->strings->urltext = (object) $def;

If $this->strings is not yet an object

so declaring it first

if (!is_object($this->strings)) {
	$this->strings = new stdClass();
}

fixes the error

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https://bugs.launchpad.net/bugs/1216453

Title:
  Warning when sending message to user

Status in Mahara ePortfolio:
  Triaged

Bug description:
  latest Mahara 1.8.0dev

  This is a regression.

  When I send a message to a user, I get the following warning after
  sending the message:

  [WAR] 11 (lib/activity.php:391) Creating default object from empty value
  Call stack (most recent first):

      log_message("Creating default object from empty value", 8, true, true, "/home/kristina/code/18stable/htdocs/lib/activity.p...", 391) at /home/kristina/code/18stable/htdocs/lib/errors.php:446
      error(2, "Creating default object from empty value", "/home/kristina/code/18stable/htdocs/lib/activity.p...", 391, array(size 2)) at /home/kristina/code/18stable/htdocs/lib/activity.php:391
      ActivityType->add_urltext(array(size 2)) at /home/kristina/code/18stable/htdocs/lib/activity.php:796
      ActivityTypeUsermessage->__construct(object(stdClass), false) at /home/kristina/code/18stable/htdocs/lib/activity.php:77
      handle_activity(object(stdClass), array(size 4)) at /home/kristina/code/18stable/htdocs/lib/activity.php:50
      activity_occurred("usermessage", array(size 4)) at /home/kristina/code/18stable/htdocs/lib/user.php:1512
      send_user_message(object(stdClass), "Hello Paula, Do you want to meet for lunch next w...", null) at /home/kristina/code/18stable/htdocs/user/sendmessage.php:117
      sendmessage_submit(object(Pieform), array(size 4)) at Unknown:0
      call_user_func_array("sendmessage_submit", array(size 2)) at /home/kristina/code/18stable/htdocs/lib/pieforms/pieform.php:528
      Pieform->__construct(array(size 3)) at /home/kristina/code/18stable/htdocs/lib/pieforms/pieform.php:170
      Pieform::process(array(size 3)) at /home/kristina/code/18stable/htdocs/lib/pieforms/pieform.php:71
      pieform(array(size 3)) at /home/kristina/code/18stable/htdocs/user/sendmessage.php:105

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