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Fatal error: Uncaught TypeError: WP_Rocket\Engine\Media\PreloadFonts\Frontend\Controller::maybe_remove_existing_preloaded_fonts(): Return value must be of type string, null returned in /www/wwwroot/samgraph.ir/wp-content/plugins/wp-rocket/inc/Engine/Media/PreloadFonts/Frontend/Controller.php:212 Stack trace: #0 /www/wwwroot/samgraph.ir/wp-content/plugins/wp-rocket/inc/Engine/Media/PreloadFonts/Frontend/Subscriber.php(114): WP_Rocket\Engine\Media\PreloadFonts\Frontend\Controller->maybe_remove_existing_preloaded_fonts() #1 /www/wwwroot/samgraph.ir/wp-includes/class-wp-hook.php(324): WP_Rocket\Engine\Media\PreloadFonts\Frontend\Subscriber->maybe_remove_existing_preloaded_fonts() #2 /www/wwwroot/samgraph.ir/wp-includes/plugin.php(205): WP_Hook->apply_filters() #3 /www/wwwroot/samgraph.ir/wp-content/plugins/wp-rocket/inc/Engine/Optimization/Buffer/Optimization.php(100): apply_filters() #4 [internal function]: WP_Rocket\Engine\Optimization\Buffer\Optimization->maybe_process_buffer() #5 /www/wwwroot/samgraph.ir/wp-includes/functions.php(5471): ob_end_flush() #6 /www/wwwroot/samgraph.ir/wp-includes/class-wp-hook.php(324): wp_ob_end_flush_all() #7 /www/wwwroot/samgraph.ir/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #8 /www/wwwroot/samgraph.ir/wp-includes/plugin.php(517): WP_Hook->do_action() #9 /www/wwwroot/samgraph.ir/wp-includes/load.php(1304): do_action() #10 [internal function]: shutdown_action_hook() #11 {main} thrown in /www/wwwroot/samgraph.ir/wp-content/plugins/wp-rocket/inc/Engine/Media/PreloadFonts/Frontend/Controller.php on line 212