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Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /home3/russianp/public_html/books/list.php:92 Stack trace: #0 /home3/russianp/public_html/books/list.php(76): getSubjIDs(Array) #1 {main} thrown in /home3/russianp/public_html/books/list.php on line 92