[Hummingbird] Hummingbird Pro: Multisite performance test generates errors

On a multisite install, when I go to a site and into Hummingbird > Performance Test and try to run the test, I get the following errors (with debugging enabled):

Notice: Array to string conversion in /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php on line 206

Notice: Array to string conversion in /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php on line 206

Notice: Array to string conversion in /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php on line 207

Notice: Array to string conversion in /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php on line 207

Fatal error: Uncaught Exception: DateTime::__construct(): Failed to parse time string (1970-01-01 Array:00) at position 11 (A): The timezone could not be found in the database in /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php:246 Stack trace: #0 /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php(246): DateTime->__construct('1970-01-01 Arra...', Object(DateTimeZone)) #1 /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php(215): WP_Hummingbird_Module_Reporting_Cron::local_to_utc('1970-01-01 Arra...') #2 /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php(67): WP_Hummingbird_Module_Reporting_Cron::get_scheduled_scan_time() #3 /home/inrs/public_html/wp-includes/class-wp-hook.php(286): WP_Hummingbird_Module_Reporting_Cron->on_init_performance_scan('') #4 /home/inrs/public_html/wp-includes/class-wp-hook.php(310 in /home/inrs/public_html/wp-content/plugins/wp-hummingbird/core/pro/modules/class-module-reporting-cron.php on line 246