Undefined index: hook_suffix

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I am getting "Undefined index: hook_suffix" error in WordPress while trying to execute the below. Here $class_name extends MyRegularClass and MyRegularClass extends WP_List_Table. Please help.

$tab_name = substr($tab_name,strlen($wpdb->prefix));
if (class_exists($tab_name.'_class')){
    $class_name = $tab_name.'_class';
    $obj = new $class_name();
} else {
    $obj = new MyRegularClass($tab_name);
}

Update: Here I am trying to display a table content in a page(in stead of adding that to a menu) using WP List Table. The issue seems to be due to calling display() before it gets a screen.

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