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[Robert Lyon <robertl@xxxxxxxxxxxxxxx>]

If I remember right this is a race condition problem as the datasets
does get defined and graph does display correctly

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https://bugs.launchpad.net/bugs/1778451

Title:
  user statistics sendjasonrequest error

Status in Mahara:
  New

Bug description:
  in admin/users/statistics.php, just loading the page will make a few
  errors show in the browsers console.

  sendjsonrequest() callback failed:  
  ReferenceError
  ​
  columnNumber: 133
  ​
  fileName: "http://maharatest/js/chartjs/Chart.min.js?v=8242 line 10 > Function"
  ​
  lineNumber: 3
  ​
  message: "datasets is not defined"
  ​
  stack: "anonymous@http://maharatest/js/chartjs/Chart.min.js?v=8242 line 10 > Function:3:133\ne@http://maharatest/js/chartjs/Chart.min.js?v=8242:10:5200\ns.template@http://maharatest/js/chartjs/Chart.min.js?v=8242:10:5260\ngenerateLegend@http://maharatest/js/chartjs/Chart.min.js?v=8242:10:11904\nfetch_graph_data/<@http://maharatest/js/mahara.js?v=8242:922:38\nsendjsonrequest/<@http://maharatest/js/mahara.js?v=8242:362:17\ni@http://maharatest/js/jquery/jquery.js?v=8242:2:27060\nadd@http://maharatest/js/jquery/jquery.js?v=8242:2:27364\nsendjsonrequest@http://maharatest/js/mahara.js?v=8242:345:5\nfetch_graph_data@http://maharatest/js/mahara.js?v=8242:903:5\n@http://maharatest/admin/users/statistics.php:455:13\ni@http://maharatest/js/jquery/jquery.js?v=8242:2:27060\nfireWith@http://maharatest/js/jquery/jquery.js?v=8242:2:27828\nready@http://maharatest/js/jquery/jquery.js?v=8242:2:29619\nJ@http://maharatest/js/jquery/jquery.js?v=8242:2:29804\n";
  ​

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