TYPO3 Core

There's an undefined array key "linkWrap" in \TYPO3\CMS\Frontend\ContentObject\Menu\TextMenuContentObject::writeMenu() in the case of ATagBeforeWrap (first case):

            if ($this->I['val']['ATagBeforeWrap'] ?? false) {
                $wrapPartsBefore = explode('|', $this->I['val']['linkWrap']);
                $wrapPartsAfter = ['', ''];
            } else {
                $wrapPartsBefore = ['', ''];
                $wrapPartsAfter = explode('|', $this->I['val']['linkWrap'] ?? '');
            }

Normally the `linkWrap` should not be empty if someone activates `ATagBeforeWrap` because it's nonsensical. But handling it does not make a lot of effort.