White Screen of Death when saving menu and SmartCrawl is active

Hi,

I suddenly started getting white pages when saving a small change on a menu. I could still apply changes from the "Customise" view in Appearance, but there are some changes that are only possible in the Menu dashboard.

I activated the debug and noticed that the only errors were related to SmartCrawl. Deactivating the plugin I could save the menu again.

An extract of the errors:

[Sat Oct  8 19:11:41 2016] [hphp] [16316:7f1e459ff700:4575:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:11:42 2016] [hphp] [16316:7f1df59ff700:4568:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:11:44 2016] [hphp] [16316:7f1e0c1ff700:4561:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:11:48 2016] [hphp] [16316:7f1e5bdff700:4566:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:11:55 2016] [hphp] [16316:7f1ddf1ff700:4580:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:11:58 2016] [hphp] [16316:7f1e765ff700:4572:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:12:39 2016] [hphp] [16316:7f1e701ff700:4562:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:12:42 2016] [hphp] [16316:7f1e811ff700:4557:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:12:49 2016] [hphp] [16316:7f1e5bdff700:4567:000002] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:12:51 2016] [hphp] [16316:7f1ddf1ff700:4581:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:12:54 2016] [hphp] [16316:7f1df59ff700:4570:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:12:55 2016] [hphp] [16316:7f1e0c1ff700:4563:000002] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:13:01 2016] [hphp] [16316:7f1e701ff700:4563:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:13:42 2016] [hphp] [16316:7f1e811ff700:4558:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:13:59 2016] [hphp] [16316:7f1ddf1ff700:4582:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:14:54 2016] [hphp] [16316:7f1e459ff700:4578:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:15:36 2016] [hphp] [16316:7f1e0c1ff700:4564:000001] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:15:42 2016] [hphp] [16316:7f1df59ff700:4571:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:15:43 2016] [hphp] [16316:7f1e765ff700:4574:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:15:53 2016] [hphp] [16316:7f1e701ff700:4564:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:15:59 2016] [hphp] [16316:7f1e701ff700:4564:000002] [] \nFatal error: File not found: /var/www/thetheatretimes.com/htdocs/wp-content/plugins/w3-total-cache/lib/W3/ObjectCache.php in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-core/admin/wds-core-taxonomy.php on line 87
[Sat Oct  8 19:15:59 2016] [hphp] [16316:7f1e5bdff700:4569:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:16:54 2016] [hphp] [16316:7f1e811ff700:4559:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:17:43 2016] [hphp] [16316:7f1ddf1ff700:4583:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:17:58 2016] [hphp] [16316:7f1e459ff700:4579:000001] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:18:00 2016] [hphp] [16316:7f1e0c1ff700:4565:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:18:11 2016] [hphp] [16316:7f1df59ff700:4572:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:18:34 2016] [hphp] [16316:7f1e765ff700:4575:000001] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:18:40 2016] [hphp] [16316:7f1e5bdff700:4570:000001] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:18:50 2016] [hphp] [16316:7f1ddf1ff700:4584:000001] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:18:50 2016] [hphp] [16316:7f1e459ff700:4580:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:18:52 2016] [hphp] [16316:7f1df59ff700:4573:000001] [] \nWarning: trim() expects parameter 1 to be string, array given in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-onpage/wds-onpage.php on line 63
[Sat Oct  8 19:19:45 2016] [hphp] [16316:7f1e701ff700:4566:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:20:00 2016] [hphp] [16316:7f1e811ff700:4561:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:20:23 2016] [hphp] [16316:7f1ddf1ff700:4585:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:20:30 2016] [hphp] [16316:7f1e459ff700:4581:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:20:46 2016] [hphp] [16316:7f1e0c1ff700:4567:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:20:54 2016] [hphp] [16316:7f1df59ff700:4574:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:21:23 2016] [hphp] [16316:7f1e765ff700:4577:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:21:45 2016] [hphp] [16316:7f1e5bdff700:4572:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:21:59 2016] [hphp] [16316:7f1e701ff700:4567:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:22:01 2016] [hphp] [16316:7f1e811ff700:4562:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37
[Sat Oct  8 19:22:04 2016] [hphp] [16316:7f1ddf1ff700:4586:000001] [] \nStrict Warning: mktime(): You should be using the time() function instead in /var/www/thetheatretimes.com/htdocs/wp-content/plugins/wpmu-dev-seo/wds-files/wds-seomoz/class-seomozapi.php on line 37