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Fatal error: Uncaught TypeError: strtoupper(): Argument #1 ($string) must be of type string, null given in /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Processor/Dom.php:145 Stack trace: #0 /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Processor/Dom.php(145): strtoupper() #1 /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Processor/Dom.php(107): WP_Rocket\Engine\Optimization\LazyRenderContent\Frontend\Processor\Dom->add_hash_to_element() #2 /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Controller.php(155): WP_Rocket\Engine\Optimization\LazyRenderContent\Frontend\Processor\Dom->add_hashes() #3 /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Controller.php(128): WP_Rocket\Engine\Optimization\LazyRenderContent\Frontend\Controller->add_hashes() #4 /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Subscriber.php(45): WP_Rocket\Engine\Optimization\LazyRenderContent\Frontend\Controller->add_hashes_when_allowed() #5 /home/niceti/domains/lavdan.ir/public_html/wp-includes/class-wp-hook.php(324): WP_Rocket\Engine\Optimization\LazyRenderContent\Frontend\Subscriber->add_hashes_when_allowed() #6 /home/niceti/domains/lavdan.ir/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters() #7 /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/Buffer/Optimization.php(100): apply_filters() #8 [internal function]: WP_Rocket\Engine\Optimization\Buffer\Optimization->maybe_process_buffer() #9 /home/niceti/domains/lavdan.ir/public_html/wp-includes/functions.php(5471): ob_end_flush() #10 /home/niceti/domains/lavdan.ir/public_html/wp-includes/class-wp-hook.php(324): wp_ob_end_flush_all() #11 /home/niceti/domains/lavdan.ir/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters() #12 /home/niceti/domains/lavdan.ir/public_html/wp-includes/plugin.php(517): WP_Hook->do_action() #13 /home/niceti/domains/lavdan.ir/public_html/wp-includes/load.php(1304): do_action() #14 [internal function]: shutdown_action_hook() #15 {main} thrown in /home/niceti/domains/lavdan.ir/public_html/wp-content/plugins/wp-rocket/inc/Engine/Optimization/LazyRenderContent/Frontend/Processor/Dom.php on line 145