[Google Analytics +] errors when activating plugin

I'm getting a whole bunch of errors after I installed and activated your Google Analytics+ plugin via Composer. I would like to evaluate your plugin for possible use on my site, but it's not usable in it current form.

I'm testing on a local dev environment:
Debian 9
Apache 2.4
PHP 7 - with Zend OPcache v7.0.27-0+deb9u1
mysql Ver 15.1 Distrib 10.1.26-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

Though you might want to know about this bug - here is the backtrace message it spits out:

Backtrace from warning 'Undefined index: google_login' at /var/www/html/web/wp-content/plugins/google-analytics-for-wordpress-mu-sitewide-and-single-blog-solution/google-analytics-async-files/class-google-analytics-async-dashboard.php 74:

/var/www/html/web/wp-content/plugins/google-analytics-for-wordpress-mu-sitewide-and-single-blog-solution/google-analytics-async-files/class-google-analytics-async-dashboard.php 1226 calling __construct()
/var/www/html/web/wp-content/plugins/google-analytics-for-wordpress-mu-sitewide-and-single-blog-solution/google-analytics-async.php 360 calling include_once()
/var/www/html/web/wp/wp-settings.php 305 calling include_once()
/var/www/html/web/wp-config.php 97 calling require_once()
/var/www/html/web/wp/wp-load.php 42 calling require_once()
/var/www/html/web/wp/wp-admin/admin.php 31 calling require_once()
/var/www/html/web/wp/wp-admin/options-general.php 10 calling require_once()
Backtrace from warning 'Cannot modify header information - headers already sent' at /var/www/html/web/wp/wp-includes/pluggable.php 1216:

/var/www/html/web/wp/wp-includes/pluggable.php 1216 calling header()
/var/www/html/web/wp-content/plugins/google-analytics-for-wordpress-mu-sitewide-and-single-blog-solution/google-analytics-async.php 265 calling wp_redirect()
/var/www/html/web/wp/wp-includes/class-wp-hook.php 286 calling handle_page_requests()
/var/www/html/web/wp/wp-includes/class-wp-hook.php 310 calling apply_filters()
/var/www/html/web/wp/wp-includes/plugin.php 453 calling do_action()
/var/www/html/web/wp/wp-admin/admin.php 156 calling do_action()
/var/www/html/web/wp/wp-admin/options-general.php 10 calling require_once()