TYPO3 Core

cache.lifetime is being checked if it is integer, but the following exception:

Oops, an error occurred!
The specified lifetime is of type "string" but a string or NULL is expected.

Corresponding lines of class.t3lib_cache_backend_redisbackend.php:

[line 347] $lifetimeIsNull = is_null($lifetime);
[line 348] $lifetimeIsInteger = is_integer($lifetime);
[line 349]
[line 350] if (!$lifetimeIsNull && !$lifetimeIsInteger) {
[line 351] throw new \InvalidArgumentException(
[line 352] 'The specified lifetime is of type "' . gettype($lifetime) . '" but a string or NULL is expected.',

It should be:

[line 352] 'The specified lifetime is of type "' . gettype($lifetime) . '" but a integer or NULL is expected.',