danieliser on "[Plugin: Popup Maker] Undefined Index debug error on local dev site"

I'm using Popup Maker to provide modals for three AWeber forms on my site. They had been working, both on the hosted version of the development site (http://77.104.139.80/~changeh8/) and on my local Desktop Server install.

Suddenly, I'm getting errors on the local site whenever I save a post, page, or popup. The local version of the site has 'WP_DEBUG', true. When I tu debug off, I do not get an error. The heading of the errors look something like this, depending on which page, post, or popup I am trying to save:

Notice: Undefined index: post in /Users/lisa/dev/changehappens.dev/wp-content/plugins/popup-maker/includes/class-pum-previews.php on line 107

Notice: Undefined index: dojodigital_toggle_title in /Users/lisa/dev/changehappens.dev/wp-content/plugins/hide-title/dojo-digital-hide-title.php on line 146

Waing: Cannot modify header information - headers already sent by (output started at /Users/lisa/dev/changehappens.dev/wp-content/plugins/popup-maker/includes/class-pum-previews.php:107) in /Users/lisa/dev/changehappens.dev/wp-admin/post.php on line 197

Waing: Cannot modify header information - headers already sent by (output started at /Users/lisa/dev/changehappens.dev/wp-content/plugins/popup-maker/includes/class-pum-previews.php:107) in /Users/lisa/dev/changehappens.dev/wp-includes/pluggable.php on line 1171

I can soldier on without debug, but that would be irresponsible of me!

https://wordpress.org/plugins/popup-maker/