** Changed in: mahara
       Status: New => Confirmed

** Changed in: mahara
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1620202

Title:
  Negative block_instance sortorders

Status in Mahara:
  Confirmed

Bug description:
  Mahara: 15.10.5
  DB: MySql
  OS: Linux
  Browser: FF

  The issue of negative sort order has reappeared again after the
  upgrade went through the script for 'Sorting out block_instance sort
  order drift'.

  When trying to edit a page, it generates the following errors:

  [WAR] a6 (lib/view.php:1946) Undefined offset: 2
  Call stack (most recent first):

      log_message("Undefined offset: 2", 8, true, true, 
"/var/www/mahara/htdocs/lib/view.php", 1946) at 
/var/www/mahara/htdocs/lib/errors.php:515
      error(8, "Undefined offset: 2", "/var/www/mahara/htdocs/lib/view.php", 
1946, array(size 6)) at /var/www/mahara/htdocs/lib/view.php:1946
      View->build_column_datastructure(2, false) at 
/var/www/mahara/htdocs/lib/view.php:1983
      View->get_row_datastructure() at /var/www/mahara/htdocs/lib/view.php:2367
      View->get_all_blocktype_css() at 
/var/www/mahara/htdocs/view/blocks.php:133

  [WAR] a6 (lib/view.php:1946) Trying to get property of non-object
  Call stack (most recent first):

      log_message("Trying to get property of non-object", 8, true, true, 
"/var/www/mahara/htdocs/lib/view.php", 1946) at 
/var/www/mahara/htdocs/lib/errors.php:515
      error(8, "Trying to get property of non-object", 
"/var/www/mahara/htdocs/lib/view.php", 1946, array(size 6)) at 
/var/www/mahara/htdocs/lib/view.php:1946
      View->build_column_datastructure(2, false) at 
/var/www/mahara/htdocs/lib/view.php:1983
      View->get_row_datastructure() at /var/www/mahara/htdocs/lib/view.php:2367
      View->get_all_blocktype_css() at 
/var/www/mahara/htdocs/view/blocks.php:133

  
  And, users aren't able to edit the layout. They get the following warning:

  Could not change the column layout. Someone else may have been editing
  the layout at the same time. Please try again later.

  
  I haven't been able to pinpoint the cause of the error.

  Bug #1613135 tried to fix the existing data. Unfortunately, the
  underlying issue still seems to exist.

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