Added Error Handling for Null Child in Nested Tabs Widget

modules/nested-tabs/widgets/nested-tabs.php

@@ -1152,6 +1152,10 @@ public function print_child( $index, $item_settings = [] ) {
 		if ( isset( $children[ $index ] ) ) {
 			$children[ $index ]->print_element();
 		}
+		else {
+		    // Handle the error appropriately
+		    error_log("Child with index {$index} does not exist.");
+		}
 		remove_filter( 'elementor/frontend/container/should_render', $add_attribute_to_container );
 	}