(cron) External blog entries tries to insert NULL into column 'created'

From moodle.org cron:

Fetching external blog entries...Default exception handler: Error writing to database Debug: Column 'created' cannot be null
INSERT INTO post (userid,module,content,uniquehash,publishstate,format,subject,summary,created,lastmodified) VALUES(?,?,?,?,?,?,?,?,?,?)
[array (
0 => '195XXX',
1 => 'blog_external',
2 => '1',
3 => 'http://YYYYYYYYY.ZZZ/YYYYY,
4 => 'site',
5 => '1',
6 => 'This entry has been removed for privacy.',
7 => 'This entry has been removed for privacy',
8 => NULL,
9 => NULL,
)]

• line 394 of /lib/dml/moodle_database.php: dml_write_exception thrown
• line 816 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
• line 858 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->insert_record_raw()
• line 211 of /blog/lib.php: call to mysqli_native_moodle_database->insert_record()
• line 457 of /lib/cronlib.php: call to blog_sync_external_entries()
• line 61 of /admin/cli/cron.php: call to cron_run()

!!! Error writing to database !!!