TYPO3 Exception 1521716622

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No site found in rootline of page 123

#1521716622 TYPO3\CMS\Core\Exception\SiteNotFoundException
No site found in rootline of page 123

When a page of type shortcut with external URL is created the slug that is automatically created looks like this: "/https//wwwfacebookcom/...".

Changing this slug to something like "/my-company" is raising the error-message shown on the screenshot.