Maps and Events plugins generate a ton of PHP notices

I am a developer developing a fully custom site. I am not going to disable debugging. I have it enabled so I can see where my code generates notices, just like these, and then I fix them. When your plugins generate a ton of errors, it makes my work a lot harder.

When saving a page or post:

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Warning: Cannot modify header information - headers already sent by (output started at /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php:550) in /wordpress/wp-admin/post.php on line 197

Warning: Cannot modify header information - headers already sent by (output started at /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php:550) in /wordpress/wp-includes/pluggable.php on line 1174

When saving a menu:

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375

Notice: Undefined index: custom_fields_map in /wordpress/wp-content/plugins/wpmu_dev_maps_plugin/inc/class-agm-admin-maps.php on line 550

Notice: Trying to get property of non-object in /wordpress/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 375