PHP notices

Hi,

I’m using WordPress 4.6 multisite and when I activate the plugin on one of the sites, the options are all empty. Once I set colors, I still can not see the bar on the website frontend and there are these PHP notices displayed:

Notice: Undefined index: wtr_progress_enable in .../wp-content/plugins/worth-the-read/worth-the-read.php on line 33 
Notice: Undefined index: wtr_progress_transparent in .../wp-content/plugins/worth-the-read/worth-the-read.php on line 38 
Notice: Undefined index: wtr_progress_comments in .../wp-content/plugins/worth-the-read/worth-the-read.php on line 39

Please fix these in your plugin update.

Regards,

Oliver