I can't seem to edit entry details all of a sudden: in this Products section (and only this one section), the page title and "Current Version" button will render, but the rest of the page is missing.

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The only clue is this line from Craft's log:

[31-Jul-2014 19:07:36 UTC] PHP Fatal error: Maximum function nesting level of '100' reached, aborting! in /Users/gob/projects/gobias/craft/app/vendor/twig/twig/lib/Twig/Node.php on line 140

I've loaded earlier MySQL backups, restarted MAMP Pro (PHP 5.5.10), cleared Craft's caches, tried different browsers and machines, and the problem persists.

  • 1
    Have you filed a bug through the dashboard widget? Looks like a bug to me... Commented Jul 31, 2014 at 20:43
  • Thanks @Marion—yes I did, and I'm actually asking here since Brad said it's come up before. Answer's on the way!
    – Matt Stein
    Commented Jul 31, 2014 at 20:44

2 Answers 2


That error isn't a Craft or PHP error, it's coming from older versions of xDebug.

It can happen on more complicated pages (lots of fields, tabs, etc.), but you can get around it by adjusting the xdebug.max_nesting_level to something higher than the default 100 or to upgrade xDebug to 2.3+, which has changed to the default value to 256.

Note that you don't have to have an active debug session going on in order to run into this, you just have to have the xDebug extension installed.

  • Thanks Brad. I set it to 250 on a whim, and all's well again.
    – Matt Stein
    Commented Jul 31, 2014 at 20:45
  • 5
    – Brad Bell
    Commented Jul 31, 2014 at 20:54
  • 5
    Philosophy majors.
    – Matt Stein
    Commented Jul 31, 2014 at 20:55
  • 1
    programmer psychologists Commented Aug 4, 2014 at 4:03
  • I am having the same issue but I don't know where to edit the "debug.max_nesting_level" setting. Can someone point me in the right direction? Commented Jan 17, 2016 at 15:07

Simplest solution is just to deactivate all debugger stuff in mamp's PHP settings -> Uncheck: Debugger Activate Xdebug.

  • 2
    That's the simplest solution provided that you're not using the debugger and/or never plan to.
    – Matt Stein
    Commented Feb 27, 2016 at 23:32

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