Archiver cron job fails after upgrading to 3.9.0

Hey,

I have just updated Matomo to 3.9.0 (from 3.8.1) and now the archiver cron job fails on execution (the same happens on manual executions via SSH). Since the error specifically asks me to check out the forums, I was hoping you could get some pointers as to where this issue may be:

WARNING [2019-03-19 14:04:22] 5782  /usr/share/nginx/www/our_website/html/core/Common.php(271): Notice - unserialize(): Error at offset 0 of 4664 bytes - Matomo 3.9.0 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already)
ERROR [2019-03-19 14:04:22] 5782  Empty or invalid response '[2019-03-19 14:04:21] piwik.DEBUG: Loaded plugins: CorePluginsAdmin, CoreAdminHome, CoreHome, WebsiteMeasurable, IntranetMeasurable, Diagnostics, CoreVisualizations, Proxy, API, Widgetize, Transitions, LanguagesManager, Actions, Dashboard, MultiSites, Referrers, UserLanguage, DevicesDetection, Goals, Ecommerce, SEO, Events, UserCountry, VisitsSummary, VisitFrequency, VisitTime, VisitorInterest, RssWidget, Feedback, Monolog, Login, TwoFactorAuth, UsersManager, SitesManager, Installation, CoreUpdater, CoreConsole, ScheduledReports, UserCountryMap, Live, CustomVariables, PrivacyManager, ImageGraph, SegmentEditor, Morpheus, Contents, BulkTracking, Resolution, DevicePlugins, Heartbeat, Intl, Marketplace, ProfessionalServices, UserId, CustomPiwikJs, DBStats, Provider, AjaxOptOut, CampaignVisitorsByTime, FormAnalytics, HeatmapSessionRecording, UsersFlow [] {"class":"Piwik\\Plugin\\Manager","request_id":5869} a:2:{s:10:"2019-03-18";a:56:{s:16:"nb_uniq_visitors";d:503;s:9:"nb_visits";d:519;s:8:"nb_users";i:0;s:10:"nb_actions";d:724;s:11:"max_actions";d:12;s:12:"bounce_count";d:412;s:16:"sum_visit_length";d:26665;s:19:"nb_visits_returning";d:76;s:20:"nb_actions_returning";d:97;s:26:"nb_uniq_visitors_returning";d:71;s:18:"nb_users_returning";i:0;s:21:"max_actions_returning";d:6;s:21:"bounce_rate_returning";s:3:"83%";s:30:"nb_actions_per_visit_returning";d:1.3;s:26:"avg_time_on_site_returning";d:76;s:14:"nb_conversions";d:15;s:19:"nb_visits_converted";d:15;s:7:"revenue";i:0;s:15:"conversion_rate";s:5:"2.89%";s:24:"nb_conversions_new_visit";d:13;s:29:"nb_visits_converted_new_visit";d:13;s:17:"revenue_new_visit";i:0;s:25:"conversion_rate_new_visit";s:5:"2.93%";s:30:"nb_conversions_returning_visit";d:2;s:35:"nb_visits_converted_returning_visit";d:2;s:23:"revenue_returning_visit";i:0;s:31:"conversion_rate_returning_visit";s:5:"2.63%";s:13:"nb_form_views";d:468;s:15:"nb_form_viewers";d:391;s:14:"nb_form_starts";d:76;s:16:"nb_form_starters";d:68;s:19:"nb_form_submissions";d:8;s:18:"nb_form_submitters";d:6;s:20:"nb_form_resubmitters";d:2;s:19:"nb_form_conversions";d:19;s:12:"nb_pageviews";d:712;s:17:"nb_uniq_pageviews";d:638;s:12:"nb_downloads";d:11;s:17:"nb_uniq_downloads";d:10;s:11:"nb_outlinks";d:1;s:16:"nb_uniq_outlinks";d:1;s:11:"nb_searches";i:0;s:11:"nb_keywords";i:0;s:28:"nb_hits_with_time_generation";d:602;s:19:"avg_time_generation";d:0.183;s:11:"bounce_rate";s:3:"79%";s:20:"nb_actions_per_visit";d:1.4;s:16:"avg_time_on_site";d:51;s:18:"form_starters_rate";s:5:"17.4%";s:19:"form_submitter_rate";s:4:"8.8%";s:20:"form_conversion_rate";s:5:"27.9%";s:22:"form_resubmitters_rate";s:5:"33.3%";s:24:"avg_form_time_hesitation";d:23.804;s:19:"avg_form_time_spent";d:62.151;s:33:"avg_form_time_to_first_submission";d:181.383;s:27:"avg_form_time_to_conversion";d:61.651;}s:10:"2019-03-19";a:56:{s:16:"nb_uniq_visitors";d:237;s:9:"nb_visits";d:246;s:8:"nb_users";i:0;s:10:"nb_actions";d:376;s:11:"max_actions";d:12;s:12:"bounce_count";d:188;s:16:"sum_visit_length";d:13306;s:19:"nb_visits_returning";d:48;s:20:"nb_actions_returning";d:65;s:26:"nb_uniq_visitors_returning";d:42;s:18:"nb_users_returning";i:0;s:21:"max_actions_returning";d:9;s:21:"bounce_rate_returning";s:3:"75%";s:30:"nb_actions_per_visit_returning";d:1.4;s:26:"avg_time_on_site_returning";d:78;s:14:"nb_conversions";d:15;s:19:"nb_visits_converted";d:15;s:7:"revenue";i:0;s:15:"conversion_rate";s:4:"6.1%";s:24:"nb_conversions_new_visit";d:15;s:29:"nb_visits_converted_new_visit";d:15;s:17:"revenue_new_visit";i:0;s:25:"conversion_rate_new_visit";s:5:"7.58%";s:30:"nb_conversions_returning_visit";i:0;s:35:"nb_visits_converted_returning_visit";i:0;s:23:"revenue_returning_visit";i:0;s:31:"conversion_rate_returning_visit";s:2:"0%";s:13:"nb_form_views";d:250;s:15:"nb_form_viewers";d:209;s:14:"nb_form_starts";d:65;s:16:"nb_form_starters";d:58;s:19:"nb_form_submissions";d:10;s:18:"nb_form_submitters";d:5;s:20:"nb_form_resubmitters";d:3;s:19:"nb_form_conversions";d:13;s:12:"nb_pageviews";d:368;s:17:"nb_uniq_pageviews";d:318;s:12:"nb_downloads";d:2;s:17:"nb_uniq_downloads";d:2;s:11:"nb_outlinks";d:3;s:16:"nb_uniq_outlinks";d:3;s:11:"nb_searches";d:3;s:11:"nb_keywords";d:2;s:28:"nb_hits_with_time_generation";d:329;s:19:"avg_time_generation";d:0.144;s:11:"bounce_rate";s:3:"76%";s:20:"nb_actions_per_visit";d:1.5;s:16:"avg_time_on_site";d:54;s:18:"form_starters_rate";s:5:"27.8%";s:19:"form_submitter_rate";s:4:"8.6%";s:20:"form_conversion_rate";s:5:"22.4%";s:22:"form_resubmitters_rate";s:3:"60%";s:24:"avg_form_time_hesitation";d:18.433;s:19:"avg_form_time_spent";d:57.694;s:33:"avg_form_time_to_first_submission";d:378.5;s:27:"avg_form_time_to_conversion";d:70.608;}}' for website id 1, Time elapsed: 0.659s, skipping

Let me know if you need any more info on our setup, we’re currently running the following PHP version on the server:

PHP 7.2.16-1+ubuntu16.04.1+deb.sury.org+1 (cli) (built: Mar  7 2019 20:23:06) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
    with Zend OPcache v7.2.16-1+ubuntu16.04.1+deb.sury.org+1, Copyright (c) 1999-2018, by Zend Technologies

Please check Notice - unserialize(): Error at offset 0 of 53988 bytes · Issue #14229 · matomo-org/matomo · GitHub for more information.

Thanks for pointing that out, I missed that. I will continue on Github.

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