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Fatal error: Uncaught TypeError: strip_tags() expects parameter 1 to be string, null given in /home/c1475421c/public_html/social-network/index.php:9 Stack trace: #0 /home/c1475421c/public_html/social-network/index.php(9): strip_tags(NULL) #1 {main} thrown in /home/c1475421c/public_html/social-network/index.php on line 9