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Fatal error: Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /usr/www/users/ixorip/sep4u.gr/sxoles/graph_eve.php:48 Stack trace: #0 {main} thrown in /usr/www/users/ixorip/sep4u.gr/sxoles/graph_eve.php on line 48