Issue: undefined index: prefixid

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August 20, 2016 6:38 PM

Alfa1

Distinguished Member

undefined index: prefixid

Code:

ErrorException: Undefined index: prefixid - vault/core/view/content/page/vw.php:658 
Generated By: Alfa, A moment ago

Stack Trace
#0 /vault/core/view/content/page/vw.php(658): XenForo_Application::handlePhpError(8, 'Undefined index...', '/home/...', 658, Array)
#1 /vault/core/view/content/page/vw.php(94): vw_Content_Page_View->process_categories(Array)
#2 /vault/core/view/factory/content/vw.php(91): vw_Content_Page_View->unwrapped(Array, NULL)
#3 /vault/core/view/factory/content/versioned/vw.php(22): vw_Factory_Content_View->get_content(Array, NULL)
#4 /vault/core/view/ui/page/vw.php(46): vw_Factory_Content_Versioned_View->make(Array, NULL)
#5 /vault/core/controller/ui/page/vw.php(789): vw_UI_Page_View->view(Object(vw_UI_Page_Controller_XF))
#6 /vault/core/controller/ui/stack/vw.php(313): vw_UI_Page_Controller->view()
#7 /vault/core/controller/ui/stack/vw.php(245): vw_UI_Stack_Controller->view()
#8 /library/vw/XenForo/ControllerPublic/Wiki.php(68): vw_UI_Stack_Controller->execute()
#9 /library/XenForo/FrontController.php(351): vw_XenForo_ControllerPublic_Wiki->actionIndex()
#10 /library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#11 /index.php(13): XenForo_FrontController->run()
#12 {main}
Request State
array(3) {
  ["url"] => string(58) "https://site.com/wiki/Aldous-Huxley"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(0) {
  }
}

Issue Details

Issue Number 4704

Issue Type Bug

Project VaultWiki 4.x Series

Category Editing Pages

Status Fixed

Priority 4 - Warnings / Script Errors

Affected Version 4.0.13

Fixed Version 4.0.14

Milestone (none)

Software DependencyXenForo 1.x

License TypePaid

Users able to reproduce bug 0

Users unable to reproduce bug 0

Attachments 0

Assigned Users (none)

Tags (none)

August 21, 2016 10:51 AM

Alfa1

Distinguished Member

Wiki content cannot be viewed due to this error.

Reply
August 21, 2016 10:52 AM

pegasus

VaultWiki Team

This error will not prevent viewing the wiki content. It is an E_NOTICE error. You must have debug mode turned on. Since debug mode halts page execution, it can cause data to be saved in an incomplete form and create more unusual errors, such as the one you see now. You should only use debug mode in development.

The only way for this to occur is if one of the categories attached to this page has no revision history for its category-page. This is not normal. It would be impossible to access that category now. If you edit this page, you will probably see a strange category attached to it called "Wiki", which should be removed.

Was this category created and/or added to the page in a recent version? Do you remember what you were doing that achieved the broken category?

It is possible that it was created in an earlier version if you created the category or purged its current revision while XenForo's debug mode was turned on and encountered an E_NOTICE or other low-level error during creation. If the original E_NOTICE was resolved, then this report is really a duplicate. The error here is a side effect of maintaining the garbage category that was created.

Since the category has no name data, finding it can be tricky. If you rebuild URLs via the wiki's Maintenance tools, you might then be able to find and remove the category in URL Conflicts (it would probably be a collision with "Wiki").

Reply
August 21, 2016 10:55 AM

Alfa1

Distinguished Member

This happens on all wiki pages. No new content was added. This issue occurred after upgrade to 4.0.13

Reply
August 21, 2016 11:41 AM

pegasus

VaultWiki Team

When you view the page, does it have a category named "Wiki" or not?

Reply
August 21, 2016 12:00 PM

Alfa1

Distinguished Member

I see 'wiki' in the breadcrumb.
I have discovered that this error doesnt occur on all pages. Articles within the same category dont have it.

Reply
August 21, 2016 12:15 PM

pegasus

VaultWiki Team

The breadcrumb points to the main wiki tab in the navbar. I am also not sure if you are thinking of "areas" when I say "categories." The stack trace suggests:

This error occurs when generating the list of categories for a wiki page, in the box that appears at the bottom of the wiki page. The box has a label "Categories". The error occurs because at least one of the categories in this box has no revision data (has no edits, has no title, etc) so it cannot be displayed properly. The problematic category would appear in this box with the name "Wiki" (which is obviously incorrect).

If this is not the behavior that occurs, then your line 658 might be different from mine.

Reply
August 21, 2016 1:01 PM
pegasus

VaultWiki Team
It is also possible for this to occur if the category in question was deleted, but for some reason (possibly another instance of debug mode damage), the page still thinks it is in the category. However, in this case, I would expect a lot more undefined index errors for the same page load than what was reported here.

In vault/core/view/content/page/vw.php, find:

Code:

if (!vw_Hard_Core::model('UI/Tab/Category')->check('can_list_tab', $category))

Replace with:

Code:

if (!$category OR !vw_Hard_Core::model('UI/Tab/Category')->check('can_list_tab', $category))
Reply
August 21, 2016 5:16 PM

Alfa1

Distinguished Member

That fixed it.

Reply
August 21, 2016 7:41 PM

pegasus

VaultWiki Team

This change will be included in the next release. It will only prevent categories that were not fully removed from the database from appearing in a member-page's category box (and throwing this E_NOTICE).

The change will not affect corrupt categories that exist but have no revision data. The best way to handle corrupt data is to remove it.

Marking this as fixed.

Reply

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Issue: undefined index: prefixid

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