MainView.qml:257: TypeError: Cannot call method 'hasOwnProperty' of null

[Olivier Tilloy]

I’ve seen the following error message printed out in the console in a variety of situations for applications using a MainView:

    file:///usr/lib/x86_64-linux-gnu/qt5/qml/Ubuntu/Components/MainView.qml:257: TypeError: Cannot call method 'hasOwnProperty' of null

It might be harmless (seems so at a first glance, at least the applications’ functionality doesn’t seem affected), but either way it should be easy to add a check in order to avoid the error message.

One way to reliably reproduce is with webbrowser-app, reveal the toolbar and click the activity button to show the activity view, then reveal the toolbar and click the activity button again to hide the view.

[Gustavo Pichorim Boiko (boiko)]

I can confirm that following the steps suggested by Olivier I get the error to show up in the application output.

[Gustavo Pichorim Boiko (boiko)]

After some more testing, I can also reliably reproduce this problem using dialer-app simply by alternating between the three tabs of the app.

[Kai Mast (kai-mast)]

I have this too in the friends app. It seems to happen when the content is moved and the Header calls isPage.

Stupid idea, just check null?

[Tim Peeters (tpeeters)]

yeah, I'll go for the stupid idea suggested above :D

[Tim Peeters (tpeeters)]

test for this bug is here: https://code.launchpad.net/~tpeeters/ubuntu-ui-toolkit/toolbar-tabs-deactivate/+merge/186065/comments/446704

[PS Jenkins bot (ps-jenkins)]

Fix committed into lp:ubuntu-ui-toolkit at revision None, scheduled for release in ubuntu-ui-toolkit, milestone Unknown

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-ui-toolkit - 0.1.46+14.04.20131108.3-0ubuntu1

---------------
ubuntu-ui-toolkit (0.1.46+14.04.20131108.3-0ubuntu1) trusty; urgency=low

  [ Leo Arias ]
  * Add a check for the autopilot version on the emulator init. (LP:
    #1248570)
  * Ensure the toolbar is opened when clicking a toolbar in autopilot
    tests. (LP: #1248487)

  [ Nicolas d'Offay ]
  * Reverted API break on the selectors. (LP: #1248646)

  [ tpeeters ]
  * Ensure the toolbar is opened when clicking a toolbar in autopilot
    tests. (LP: #1248487)
  * before fixing the actual bug, the test gives me these errors: QWARN
    : tst_MainView::testNoWarnings_bug186065()
    unity::action::ActionManager::ActionManager(QObject*): Could not
    determine application identifier. HUD will not work properly.
    Provide your application identifier in $APP_ID environment variable.
    QWARN : tst_MainView::testNoWarnings_bug186065()
    file:///home/tim/dev/ubuntu-ui-
    toolkit/fix1244660/modules/Ubuntu/Components/MainView.qml:257:
    TypeError: Cannot call method 'hasOwnProperty' of null **
    (process:27191): CRITICAL **: Unable to get session bus: Operation
    was cancelled QWARN : tst_MainView::testNoWarnings_bug186065() Don't
    know how to handle 'QList<QQmlError>', use qRegisterMetaType to
    register it. PASS : tst_MainView::testNoWarnings_bug186065() PASS :
    tst_MainView::cleanupTestCase() Totals: 8 passed, 0 failed, 0
    skipped ********* Finished testing of tst_MainView ********* I get
    the same when I execute unit_x11/tst_orientation/tst_orientation:
    QWARN : tst_OrientationTest::test_defaults() Don't know how to
    handle 'QList<QQmlError>', use qRegisterMetaType to register it.
    PASS : tst_OrientationTest::test_defaults() Should I execute the
    tests in a different way?. (LP: #186065, #1244660)

  [ Robert Bruce Park ]
  * (no message)

  [ Ubuntu daily release ]
  * Automatic snapshot from revision 828
 -- Ubuntu daily release <email address hidden> Fri, 08 Nov 2013 22:02:57 +0000