More info
1) Here’s the diagnostic info that you ask for in your Help tab
PHP Version: 7.0.30-0ubuntu0.16.04.1
Wordpress Version: 4.9.8
Plugin Version: 2.5
HTTP OR HTTPS: HTTPS
Active Plugins:
Gravity Forms
WordPress Backup & Security Plugin – BlogVault
CaptainForm
Contact Form 7
GetFiveStars Widget
Google Tag Manager
The Hack Repair Guy’s Plugin Archiver
Insert Headers and Footers
Link Library
MainWP Child Reports
MainWP Child
Newsletter – Archive
Newsletter – Reports
Newsletter – Sendgrid
Newsletter
Pixabay Images
RSS Includes Pages
SendGrid
Shortcodes Ultimate
Stream
The Hack Repair Guy’s Admin Login Notifier
Yoast SEO Premium
WP Google My Business Auto Publish
2) If I disable all of the plugins except for your plugin, then when I try to publish I get these error messages:
Warning: Invalid argument supplied for foreach() in /nas/content/staging/pegasushc/wp-content/plugins/wp-google-my-business-auto-publish/wp-google-my-business-auto-publish.php on line 1755
Warning: Invalid argument supplied for foreach() in /nas/content/staging/pegasushc/wp-content/plugins/wp-google-my-business-auto-publish/wp-google-my-business-auto-publish.php on line 1755
Warning: Invalid argument supplied for foreach() in /nas/content/staging/pegasushc/wp-content/plugins/wp-google-my-business-auto-publish/wp-google-my-business-auto-publish.php on line 1755
Warning: Invalid argument supplied for foreach() in /nas/content/staging/pegasushc/wp-content/plugins/wp-google-my-business-auto-publish/wp-google-my-business-auto-publish.php on line 1755
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Does that help?