Current updates for abandoned plugin - Visual Editor Custom Buttons https://wordpress.org/plugins/visual-editor-custom-buttons/
This plugin has not been updated in 8 months and breaks in WP 4.5+
Error Log is throwing these errors:
[11-Oct-2016 14:06:37 UTC] PHP Notice: Trying to get property of non-object in /home/*/public_html/*/wp-content/plugins/visual-editor-custom-buttons/visual-editor-custom-buttons.php on line 1048
[11-Oct-2016 14:06:37 UTC] PHP Notice: Undefined variable: count in /home/*/public_html/*/wp-content/plugins/visual-editor-custom-buttons/visual-editor-custom-buttons.php on line 1055
[11-Oct-2016 14:06:37 UTC] PHP Notice: Undefined variable: post in /home/*/public_html/*/wp-content/plugins/visual-editor-custom-buttons/visual-editor-custom-buttons.php on line 1048