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Warning: Undefined array key "abstract" in /www/sites/xkcms/index/core/book.php on line 48

Fatal error: Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in /www/sites/xkcms/index/core/functions.php:536 Stack trace: #0 /www/sites/xkcms/index/core/functions.php(536): array_filter(NULL) #1 /www/sites/xkcms/index/core/book.php(79): filter_similar_elements(NULL, 0.8) #2 /www/sites/xkcms/index/core/book.php(48): Book::generateIntro(NULL) #3 /www/sites/xkcms/index/index.php(69): Book::GetBookByPath('c3vU2El', '/{bid}.html', 'rico') #4 {main} thrown in /www/sites/xkcms/index/core/functions.php on line 536