Strict type exception from Timeline occurs when using a Schedule block and Publish later combination.

Steps:

1. Create new Landing Page.
2. Add Content Scheduler block.
3. Add one item with airtime now.
4. Add second item with airtime in a week.
5. Publish LP.
6. Edit LP.
7. Publish later in a week (same day as in step 4).
8. Open Timeline.
9. Switch to date from steps 4 & 7.

Actual result: Exception occurs

Argument 3 passed to EzSystems\EzPlatformPageBuilderBundle\Controller\PageController::locationViewAction() must be of the type int or null, string given, called in /Users/michalszoltysek/Projects/workspace/ez4.lh/vendor/symfony/http-kernel/HttpKernel.php on line 157

Remarks: Could not reproduce on 2.5.10.