I get this error using this plugin https://www.ads-software.com/plugins/custom-post-types/
When try to edit a custom post…

Error: An error occurred while running ‘mapSelect’: Cannot read property ‘pgc_sgb_lightbox_settings’ of undefined
The error may be correlated with this previous error:
TypeError: Cannot read property ‘pgc_sgb_lightbox_settings’ of undefined
at ***********/wp-content/plugins/simply-gallery-block/dist/plugin.build.js?ver=1.3.0:1:32112

I fix it in my local installation in this way…

			if (e("core/editor").getEditedPostAttribute("meta")) {
				return {
					metaFieldValue: e("core/editor").getEditedPostAttribute("meta").pgc_sgb_lightbox_settings
				}
			} else {
				return {
					metaFieldValue: ''
				}
			}