[TYPO3-english] Can't create sys_category

[Camila Lopez Chacon]

Hello.

We are unable to create a sys_category, we get the following error message:

2: SQL error: 'Incorrect integer value: '' for column 'single_pid' at row 1' (sys_category:NEW58ef881a7bd29094132479)

Has anybody encountered this?

TYPO3 7.6.16
PHP 7.0.15
SQL 5.7.17

Thank you

Camila