Fatal Error With Checkboxes and Malformed URL

Problem/Motivation

LogicException: Cannot create key "123" on non-array value. in Drupal\Component\Utility\NestedArray::setValue() (line 154 of core/lib/Drupal/Component/Utility/NestedArray.php).

Steps to reproduce

1. Create view with an exposed filter using checkboxes
2. Filter on an item to create a URL like https://example.com?tags[123]=123
3. Change the URL to https://example.com?tags and the page will crash.

Proposed resolution

Find where the URL parameter is passed to setValue() and add a check.

Remaining tasks

1. Fix
2. Create a test

User interface changes

API changes

Data model changes