TYPO3 Core

When I copy a page, I got an error from the typo3_src-6.2.17/typo3/sysext/core/Classes/DataHandling/DataHandler.php telling me, getTimestamp causes an error.

This is somehow, because the $dateTime here has the value FALSE, but it should have at least the value 0000-00-00.

Problem Line ~1729: $value = $value === $emptyValue: $dateTime->getTimestamp();
Fix: $value = $value === $emptyValue || $dateTime === false ? 0 : $dateTime->getTimestamp();

This might be due to a customised TCA in my table PAGES using DATE as a database field.

"tx_mask_eventstart": {
                "config": {
                    "type": "input",
                    "dbType": "date",
                    "size": "8",
                    "max": "20",
                    "eval": "date" 
                },
                "key": "eventstart",
                "l10n_mode": "exclude" 
            },