XF 1.5 Allowed memory size exhausted (apc search)

[dutchbb]

Got this error on php 7.1, no problem in 5.6 before.

Had this before in the error_log some time back, but first time on server error log. I think i also switched to 7.1 for testing then, but not sure.

ErrorException: Fatal Error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 20480 bytes) - library/Zend/Db/Statement/Mysqli.php:304
Gegenereerd Door: bodybuilding.nl, Vandaag om 01:07
Stack Trace
#0 [internal function]: XenForo_Application::handleFatalError()
#1 {main}
Aanvraagstatus
array(3) {
  ["url"] => string(47) "https://forum.bodybuilding.nl/admin.php?search/"
  ["_GET"] => array(1) {
   ["search/"] => string(0) ""
  }
  ["_POST"] => array(5) {
   ["q"] => string(1) "t"
   ["_xfToken"] => string(8) "********"
   ["_xfRequestUri"] => string(10) "/admin.php"
   ["_xfNoRedirect"] => string(1) "1"
   ["_xfResponseType"] => string(4) "json"
  }
}