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Fatal error: Uncaught TypeError: mysqli_escape_string(): Argument #1 ($mysql) must be of type mysqli, null given in /home/project/2024_2025/cle2_t9/product.php:5 Stack trace: #0 /home/project/2024_2025/cle2_t9/product.php(5): mysqli_escape_string(NULL, '0') #1 {main} thrown in /home/project/2024_2025/cle2_t9/product.php on line 5