Using simplesearch @self route for a collection page throws error

[fredrikekelund]

I don't know what details you might need to reproduce this, but basically what I'm trying to do is to add a simplesearch configuration to a collection page, to be able to query its children. I'm using this page frontmatter:

---
title: Projects
simplesearch:
    route: @self
    filter_combinator: and
    filters:
        - @self
content:
    items: '@self.children'
---

And I'm getting this exception:

Whoops\Exception\ErrorException thrown with message "Indirect modification of overloaded property Grav\Common\Data\Data::$route has no effect"

Stacktrace:
#15 Whoops\Exception\ErrorException in /vagrant/grav-admin/vendor/rockettheme/toolbox/ArrayTraits/src/NestedArrayAccess.php:64
#14 Whoops\Run:handleError in /vagrant/grav-admin/vendor/rockettheme/toolbox/ArrayTraits/src/NestedArrayAccess.php:64
#13 Grav\Common\Data\Data:set in /vagrant/grav-admin/user/plugins/simplesearch/simplesearch.php:103
#12 Grav\Plugin\SimplesearchPlugin:onPagesInitialized in /vagrant/grav-admin/vendor/symfony/event-dispatcher/EventDispatcher.php:184
#11 call_user_func in /vagrant/grav-admin/vendor/symfony/event-dispatcher/EventDispatcher.php:184
#10 Symfony\Component\EventDispatcher\EventDispatcher:doDispatch in /vagrant/grav-admin/vendor/symfony/event-dispatcher/EventDispatcher.php:46
#9 Symfony\Component\EventDispatcher\EventDispatcher:dispatch in /vagrant/grav-admin/vendor/rockettheme/toolbox/Event/src/EventDispatcher.php:23
#8 RocketTheme\Toolbox\Event\EventDispatcher:dispatch in /vagrant/grav-admin/system/src/Grav/Common/Grav.php:272
#7 Grav\Common\Grav:fireEvent in /vagrant/grav-admin/system/src/Grav/Common/Processors/PagesProcessor.php:25
#6 Grav\Common\Processors\PagesProcessor:process in /vagrant/grav-admin/system/src/Grav/Common/Grav.php:121
#5 Grav\Common\Grav:Grav\Common\{closure} in /vagrant/grav-admin/system/src/Grav/Common/Grav.php:358
#4 Grav\Common\Grav:Grav\Common\{closure} in /vagrant/grav-admin/system/src/Grav/Common/Grav.php:334
#3 call_user_func_array in /vagrant/grav-admin/system/src/Grav/Common/Grav.php:334
#2 Grav\Common\Grav:__call in /vagrant/grav-admin/system/src/Grav/Common/Grav.php:122
#1 Grav\Common\Grav:measureTime in /vagrant/grav-admin/system/src/Grav/Common/Grav.php:122
#0 Grav\Common\Grav:process in /vagrant/grav-admin/index.php:45

But if I change the route property on row 3 to read route: /projects (which is the actual URL of the page itself), it works fine.

I'm using the latest version of simplesearch, with the default configuration.

[A----]

I have the same exception on php 5.5.25. Cannot reproduce it on 5.6 though.

[flaviocopes]

@fredrikekelund @A---- should be fixed by 2bf8c62 if you can test it