I believe I have the same issue since upgrading to Matomo 3.9.0 this morning…
$ /usr/bin/php /home/analytics/public_html/console core:archive --url=https://analytics.example.com/
INFO [2019-03-19 09:58:42] 5768 ---------------------------
INFO [2019-03-19 09:58:42] 5768 INIT
INFO [2019-03-19 09:58:42] 5768 Running Matomo 3.9.0 as Super User
INFO [2019-03-19 09:58:42] 5768 ---------------------------
INFO [2019-03-19 09:58:42] 5768 NOTES
INFO [2019-03-19 09:58:42] 5768 - Reports for today will be processed at most every 150 seconds. You can change this value in Matomo UI > Settings > General Settings.
INFO [2019-03-19 09:58:42] 5768 - Reports for the current week/month/year will be requested at most every 3600 seconds.
INFO [2019-03-19 09:58:42] 5768 - Archiving was last executed without error 1 hours 23 min ago
INFO [2019-03-19 09:58:42] 5768 ---------------------------
INFO [2019-03-19 09:58:42] 5768 START
INFO [2019-03-19 09:58:42] 5768 Starting Matomo reports archiving...
INFO [2019-03-19 09:58:42] 5768 - tracking data found for website id 1 since 2019-03-19 08:35:06 UTC (since the last successful archiving)
INFO [2019-03-19 09:58:42] 5768 Will pre-process for website id = 1, period = day, date = last2
INFO [2019-03-19 09:58:42] 5768 - pre-processing all visits
WARNING [2019-03-19 09:58:43] 5768 /home/analytics/public_html/core/Common.php(271): Notice - unserialize(): Error at offset 0 of 112139 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 09:58:43] 5768 Empty or invalid response '[2019-03-19 09:58:43] piwik.DEBUG: Loaded plugins: CorePluginsAdmin, CoreAdminHome, CoreHome, WebsiteMeasurable, IntranetMeasurable, Diagnostics, CoreVisualizations, Proxy, API, ExamplePlugin, Widgetize, Transitions, LanguagesManager, Actions, Dashboard, MultiSites, Referrers, UserLanguage, DevicesDetection, Goals, Ecommerce, SEO, Events, UserCountry, GeoIp2, VisitsSummary, VisitFrequency, VisitTime, VisitorInterest, ExampleAPI, RssWidget, Monolog, Login, TwoFactorAuth, UsersManager, SitesManager, Installation, CoreUpdater, CoreConsole, ScheduledReports, UserCountryMap, Live, CustomVariables, PrivacyManager, ImageGraph, Annotations, MobileMessaging, Overlay, SegmentEditor, Insights, Morpheus, Contents, BulkTracking, Resolution, DevicePlugins, Heartbeat, Intl, Marketplace, UserId, CustomPiwikJs, ForceSSL, MarketingCampaignsReporting, SecurityInfo [] {"class":"Piwik\\Plugin\\Manager","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: /* trigger = CronArchive */ SELECT count(distinct log_visit.idvisitor) AS `1`, count(*) AS `2`, sum(log_visit.visit_total_actions) AS `3`, max(log_visit.visit_total_actions) AS `4`, sum(log_visit.visit_total_time) AS `5`, sum(case log_visit.visit_total_actions when 1 then 1 when 0 then 1 else 0 end) AS `6`, sum(case log_visit.visit_goal_converted when 1 then 1 else 0 end) AS `7`, count(distinct log_visit.user_id) AS `39` FROM matomo_log_visit AS log_visit WHERE log_visit.visit_last_action_time >= ? AND log_visit.visit_last_action_time <= ? AND log_visit.idsite IN (?) [] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Initializing archiving process for all plugins [visits = 28, visits converted = 0] ["callAggregateAllPlugins","28","0"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Archiving day reports for plugin 'ExamplePlugin'. ["callAggregateAllPlugins","ExamplePlugin"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Memory delta: 344 B while archiving day reports for plugin 'ExamplePlugin' (for segment = ''). ["callAggregateAllPlugins","Memory delta: 344 B","day","ExamplePlugin","(for segment = '')"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Archiving day reports for plugin 'Actions'. ["callAggregateAllPlugins","Actions"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: /* trigger = CronArchive */ SELECT log_action.name, log_action.type, log_action.idaction, log_action.url_prefix, count(distinct log_link_visit_action.idvisit) as `2`, count(distinct log_link_visit_action.idvisitor) as `1`, count(*) as `12`, sum( case when custom_float is null then 0 else custom_float end ) / 1000 as `30`, sum( case when custom_float is null then 0 else 1 end ) as `31`, min(custom_float) / 1000 as `32`, max(custom_float) / 1000 as `33`, CASE WHEN (MAX(log_link_visit_action.custom_var_v5) = 0 AND log_link_visit_action.custom_var_k5 = '_pk_scount') THEN 1 ELSE 0 END AS `28`, SUM( CASE WHEN log_action_name_ref.type = 8 THEN 1 ELSE 0 END) AS `29` FROM matomo_log_link_visit_action AS log_link_visit_action LEFT JOIN matomo_log_action AS log_action ON log_link_visit_action.%s = log_action.idaction LEFT JOIN matomo_log_action AS log_action_name_ref ON log_link_visit_action.idaction_name_ref = log_action_name_ref.idaction WHERE log_link_visit_action.server_time >= ? AND log_link_visit_action.server_time <= ? AND log_link_visit_action.idsite IN (?) AND log_link_visit_action.%s IS NOT NULL AND log_link_visit_action.idaction_event_category IS NULL GROUP BY log_link_visit_action.%s ORDER BY `12` DESC, name ASC [] {"class":"Actions","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: /* trigger = CronArchive */ SELECT log_action.name, log_action.type, log_action.idaction, log_action.url_prefix, count(distinct log_link_visit_action.idvisit) as `2`, count(distinct log_link_visit_action.idvisitor) as `1`, count(*) as `12`, sum( case when custom_float is null then 0 else custom_float end ) / 1000 as `30`, sum( case when custom_float is null then 0 else 1 end ) as `31`, min(custom_float) / 1000 as `32`, max(custom_float) / 1000 as `33`, CASE WHEN (MAX(log_link_visit_action.custom_var_v5) = 0 AND log_link_visit_action.custom_var_k5 = '_pk_scount') THEN 1 ELSE 0 END AS `28`, SUM( CASE WHEN log_action_name_ref.type = 8 THEN 1 ELSE 0 END) AS `29` FROM matomo_log_link_visit_action AS log_link_visit_action LEFT JOIN matomo_log_action AS log_action ON log_link_visit_action.%s = log_action.idaction LEFT JOIN matomo_log_action AS log_action_name_ref ON log_link_visit_action.idaction_name_ref = log_action_name_ref.idaction WHERE log_link_visit_action.server_time >= ? AND log_link_visit_action.server_time <= ? AND log_link_visit_action.idsite IN (?) AND log_link_visit_action.%s IS NOT NULL AND log_link_visit_action.idaction_event_ca
INFO [2019-03-19 09:58:43] 5768 - no new tracking data for website id 2 since 2019-03-19 08:35:06 UTC (since the last successful archiving)
INFO [2019-03-19 09:58:43] 5768 Skipped website id 2 as archiving is not needed
INFO [2019-03-19 09:58:43] 5768 - no new tracking data for website id 3 since 2019-03-19 08:35:06 UTC (since the last successful archiving)
INFO [2019-03-19 09:58:43] 5768 Skipped website id 3 as archiving is not needed
INFO [2019-03-19 09:58:43] 5768 - no new tracking data for website id 4 since 2019-03-19 08:35:06 UTC (since the last successful archiving)
INFO [2019-03-19 09:58:43] 5768 Skipped website id 4 as archiving is not needed
INFO [2019-03-19 09:58:43] 5768 - no new tracking data for website id 5 since 2019-03-19 08:35:06 UTC (since the last successful archiving)
INFO [2019-03-19 09:58:43] 5768 Skipped website id 5 as archiving is not needed
INFO [2019-03-19 09:58:43] 5768 - no new tracking data for website id 6 since 2019-03-19 08:35:06 UTC (since the last successful archiving)
INFO [2019-03-19 09:58:43] 5768 Skipped website id 6 as archiving is not needed
INFO [2019-03-19 09:58:43] 5768 - no new tracking data for website id 7 since 2019-03-19 08:35:06 UTC (since the last successful archiving)
INFO [2019-03-19 09:58:43] 5768 Skipped website id 7 as archiving is not needed
INFO [2019-03-19 09:58:43] 5768 Done archiving!
INFO [2019-03-19 09:58:43] 5768 ---------------------------
INFO [2019-03-19 09:58:43] 5768 SUMMARY
INFO [2019-03-19 09:58:43] 5768 Total visits for today across archived websites: 0
INFO [2019-03-19 09:58:43] 5768 Archived today's reports for 0 websites
INFO [2019-03-19 09:58:43] 5768 Archived week/month/year for 0 websites
INFO [2019-03-19 09:58:43] 5768 Skipped 7 websites
INFO [2019-03-19 09:58:43] 5768 - 6 skipped because no new visit since the last script execution
INFO [2019-03-19 09:58:43] 5768 - 0 skipped because existing daily reports are less than 150 seconds old
INFO [2019-03-19 09:58:43] 5768 - 0 skipped because existing week/month/year periods reports are less than 3600 seconds old
INFO [2019-03-19 09:58:43] 5768 - 1 skipped because got an error while querying reporting API
INFO [2019-03-19 09:58:43] 5768 Total API requests: 0
INFO [2019-03-19 09:58:43] 5768 done: 0/7 0%, 0 vtoday, 0 wtoday, 0 wperiods, 0 req, 1331 ms, 1 errors.
INFO [2019-03-19 09:58:43] 5768 Time elapsed: 1.331s
INFO [2019-03-19 09:58:43] 5768 ---------------------------
INFO [2019-03-19 09:58:43] 5768 SCHEDULED TASKS
INFO [2019-03-19 09:58:43] 5768 Starting Scheduled tasks...
INFO [2019-03-19 09:58:43] 5768 done
INFO [2019-03-19 09:58:43] 5768 ---------------------------
INFO [2019-03-19 09:58:43] 5768 ---------------------------
INFO [2019-03-19 09:58:43] 5768 SUMMARY OF ERRORS
INFO [2019-03-19 09:58:43] 5768 Error: Empty or invalid response '[2019-03-19 09:58:43] piwik.DEBUG: Loaded plugins: CorePluginsAdmin, CoreAdminHome, CoreHome, WebsiteMeasurable, IntranetMeasurable, Diagnostics, CoreVisualizations, Proxy, API, ExamplePlugin, Widgetize, Transitions, LanguagesManager, Actions, Dashboard, MultiSites, Referrers, UserLanguage, DevicesDetection, Goals, Ecommerce, SEO, Events, UserCountry, GeoIp2, VisitsSummary, VisitFrequency, VisitTime, VisitorInterest, ExampleAPI, RssWidget, Monolog, Login, TwoFactorAuth, UsersManager, SitesManager, Installation, CoreUpdater, CoreConsole, ScheduledReports, UserCountryMap, Live, CustomVariables, PrivacyManager, ImageGraph, Annotations, MobileMessaging, Overlay, SegmentEditor, Insights, Morpheus, Contents, BulkTracking, Resolution, DevicePlugins, Heartbeat, Intl, Marketplace, UserId, CustomPiwikJs, ForceSSL, MarketingCampaignsReporting, SecurityInfo [] {"class":"Piwik\\Plugin\\Manager","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: /* trigger = CronArchive */ SELECT count(distinct log_visit.idvisitor) AS `1`, count(*) AS `2`, sum(log_visit.visit_total_actions) AS `3`, max(log_visit.visit_total_actions) AS `4`, sum(log_visit.visit_total_time) AS `5`, sum(case log_visit.visit_total_actions when 1 then 1 when 0 then 1 else 0 end) AS `6`, sum(case log_visit.visit_goal_converted when 1 then 1 else 0 end) AS `7`, count(distinct log_visit.user_id) AS `39` FROM matomo_log_visit AS log_visit WHERE log_visit.visit_last_action_time >= ? AND log_visit.visit_last_action_time <= ? AND log_visit.idsite IN (?) [] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Initializing archiving process for all plugins [visits = 28, visits converted = 0] ["callAggregateAllPlugins","28","0"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Archiving day reports for plugin 'ExamplePlugin'. ["callAggregateAllPlugins","ExamplePlugin"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Memory delta: 344 B while archiving day reports for plugin 'ExamplePlugin' (for segment = ''). ["callAggregateAllPlugins","Memory delta: 344 B","day","ExamplePlugin","(for segment = '')"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: PluginsArchiver::callAggregateAllPlugins: Archiving day reports for plugin 'Actions'. ["callAggregateAllPlugins","Actions"] {"class":"VisitsSummary","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: /* trigger = CronArchive */ SELECT log_action.name, log_action.type, log_action.idaction, log_action.url_prefix, count(distinct log_link_visit_action.idvisit) as `2`, count(distinct log_link_visit_action.idvisitor) as `1`, count(*) as `12`, sum( case when custom_float is null then 0 else custom_float end ) / 1000 as `30`, sum( case when custom_float is null then 0 else 1 end ) as `31`, min(custom_float) / 1000 as `32`, max(custom_float) / 1000 as `33`, CASE WHEN (MAX(log_link_visit_action.custom_var_v5) = 0 AND log_link_visit_action.custom_var_k5 = '_pk_scount') THEN 1 ELSE 0 END AS `28`, SUM( CASE WHEN log_action_name_ref.type = 8 THEN 1 ELSE 0 END) AS `29` FROM matomo_log_link_visit_action AS log_link_visit_action LEFT JOIN matomo_log_action AS log_action ON log_link_visit_action.%s = log_action.idaction LEFT JOIN matomo_log_action AS log_action_name_ref ON log_link_visit_action.idaction_name_ref = log_action_name_ref.idaction WHERE log_link_visit_action.server_time >= ? AND log_link_visit_action.server_time <= ? AND log_link_visit_action.idsite IN (?) AND log_link_visit_action.%s IS NOT NULL AND log_link_visit_action.idaction_event_category IS NULL GROUP BY log_link_visit_action.%s ORDER BY `12` DESC, name ASC [] {"class":"Actions","request_id":5858} [2019-03-19 09:58:43] piwik.DEBUG: /* trigger = CronArchive */ SELECT log_action.name, log_action.type, log_action.idaction, log_action.url_prefix, count(distinct log_link_visit_action.idvisit) as `2`, count(distinct log_link_visit_action.idvisitor) as `1`, count(*) as `12`, sum( case when custom_float is null then 0 else custom_float end ) / 1000 as `30`, sum( case when custom_float is null then 0 else 1 end ) as `31`, min(custom_float) / 1000 as `32`, max(custom_float) / 1000 as `33`, CASE WHEN (MAX(log_link_visit_action.custom_var_v5) = 0 AND log_link_visit_action.custom_var_k5 = '_pk_scount') THEN 1 ELSE 0 END AS `28`, SUM( CASE WHEN log_action_name_ref.type = 8 THEN 1 ELSE 0 END) AS `29` FROM matomo_log_link_visit_action AS log_link_visit_action LEFT JOIN matomo_log_action AS log_action ON log_link_visit_action.%s = log_action.idaction LEFT JOIN matomo_log_action AS log_action_name_ref ON log_link_visit_action.idaction_name_ref = log_action_name_ref.idaction WHERE log_link_visit_action.server_time >= ? AND log_link_visit_action.server_time <= ? AND log_link_visit_action.idsite IN (?) AND log_link_visit_action.%s IS NOT NULL AND log_link_visit_action.idaction_event_ca
ERROR [2019-03-19 09:58:43] 5768 1 total errors during this script execution, please investigate and try and fix these errors.
[Exception]
1 total errors during this script execution, please investigate and try and fix these errors.
core:archive [--url="..."] [--force-all-websites] [--force-all-periods[="..."]] [--force-timeout-for-periods[="..."]] [--skip-idsites[="..."]] [--skip-all-segments] [--force-idsites[="..."]] [--force-periods[="..."]] [--force-date-last-n="..."] [--force-date-range[="..."]] [--force-idsegments="..."] [--concurrent-requests-per-website[="..."]] [--concurrent-archivers[="..."]] [--disable-scheduled-tasks] [--accept-invalid-ssl-certificate] [--php-cli-options[="..."]]