Description

Upon saving a new entry where the Entry URI format for that section includes a filter, Craft throws a error:

Argument 1 passed to craft\web\twig\Extension::kebabFilter() must be of the type string, null given

Steps to reproduce

1. Create New Section, "Test Section"
2. Set entry URI to test-section/{type.name|kebab}/{slug} (or test-section/{{object.type.name|kebab}}/{slug} will also work).
3. Attempt to create new entry in newly created section.

Additional info

• Craft version: Craft CMS 3.0.11
• PHP version: 7.1.17