Fatal error: Declaration of NspagesTreeNsNode::offsetExists(mixed

$offset): bool must be compatible with ArrayAccess::offsetExists($ offset) in /var/www/html/lib/plugins/nspages/printers/printerTree.php on line 249
dokuwiki\Exception\FatalException: Declaration of NspagesTreeNsNode::offsetExists(mixed offset):boolmustbecompatiblewithArrayAccess::offsetExists(<script type="math/tex" id="MathJax-Element-2">offset): bool must be compatible with ArrayAccess::offsetExists(</script>offset)

dokuwiki\Exception\FatalException: Declaration of NspagesTreeNsNode::offsetExists(mixed $offset): bool must be compatible with ArrayAccess::offsetExists($ offset)

An unforeseen error has occured. This is most likely a bug somewhere. It might be a problem in the nspages plugin.

More info has been written to the DokuWiki error log.

dokuwiki\Exception\FatalException: Declaration of NspagesTreeNsNode::offsetExists(mixed offset):boolmustbecompatiblewithArrayAccess::offsetExists(offset): bool must be compatible with ArrayAccess::offsetExists(offset)

dokuwiki\Exception\FatalException: Declaration of NspagesTreeNsNode::offsetExists(mixed $offset): bool must be compatible with ArrayAccess::offsetExists($ offset)