Notice: Trying to access array offset on value of type bool in responsive_menu_tree_output()

Im proposing this fix, if it makes any sense, I'm not a developer:

    if (
        isset($data['link']['href'], $router_item['tab_root_href'], $_GET['q']) &&  // Check if the variables are set
        is_array($data['link']['href']) &&                                          // Check if $data['link']['href'] is an array
        is_array($router_item['tab_root_href']) &&                                  // Check if $router_item['tab_root_href'] is an array
        is_array($_GET['q']) &&                                                     // Check if $_GET['q'] is an array
        $data['link']['href'] == $router_item['tab_root_href'] &&                    // Perform the comparison
        $data['link']['href'] != $_GET['q']
    ) {
        $data['link']['localized_options']['attributes']['class'][] = 'active';
    }

Hi miguelbraga
I am providing patch for this issue in D7, added isset() checks to ensure the existence of the required keys and used is_array() and is_string() functions to validate the data types,which helps to prevent the "array offset on value of type bool" error.

@dineshkumarbollu, I review that this implies and moving it to the RTBC.