Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in /home/papersdb/web_docs/includes/pdPublication.php:1252
Stack trace:
#0 /home/papersdb/web_docs/includes/pdPublication.php(1252): array_keys()
#1 /home/papersdb/web_docs/includes/pdPublication.php(958): pdPublication->getInfoForCitation()
#2 /home/papersdb/web_docs/view_publication.php(159): pdPublication->getCitationHtml()
#3 /home/papersdb/web_docs/view_publication.php(87): view_publication->showPublication()
#4 /home/papersdb/web_docs/view_publication.php(264): view_publication->__construct()
#5 {main}
thrown in /home/papersdb/web_docs/includes/pdPublication.php on line 1252