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Not a bug Undefined index: post_date

#1
Could someone please explain this?
Code:
Server error log entry
Error Information
ErrorException: Undefined index: post_date - library/DoublePostings/DataWriter/Post.php:21
User-Generated: The trade union committee of students , Today at 15:46
Stack Trace
#0 /home/<servername>/public_html/library/DoublePostings/DataWriter/Post.php(21): XenForo_Application::handlePhpError(8, 'Undefined index...', '/home/rnimuorg/...', 21, Array)
#1 /home/<servername>/public_html/library/XenResource/DataWriter/Update.php(266): DoublePostings_DataWriter_Post->save()
#2 /home/<servername>/public_html/library/XenResource/DataWriter/Update.php(133): XenResource_DataWriter_Update->_updateThread(Array)
#3 /home/<servername>/public_html/library/XenForo/DataWriter.php(1385): XenResource_DataWriter_Update->_postSave()
#4 /home/<servername>/public_html/library/XenResource/DataWriter/Version.php(195): XenForo_DataWriter->save()
#5 /home/<servername>/public_html/library/XenForo/DataWriter.php(1385): XenResource_DataWriter_Version->_postSave()
#6 /home/<servername>/public_html/library/XenResource/ControllerPublic/Resource.php(2115): XenForo_DataWriter->save()
#7 /home/<servername>/public_html/library/XenForo/FrontController.php(310): XenResource_ControllerPublic_Resource->actionSaveVersion()
# 8 / home / <servername> / public_html / library / XenForo / FrontController.php (132): XenForo_FrontController-> dispatch (Object (XenForo_RouteMatch))
# 9 / home / <servername> / public_html / index.php (13): XenForo_FrontController-> run ()
#10 {main}
Contents of the request
array(3) {
  ["Url"] => string (42) "<servername>/rs/gazeta.89/save-version"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(11) {
    ["resource_file_type"] => string(3) "url"
    ["download_url"] => string(74) "link"
    ["version_string"] => string(5) "09.12"
    ["Title"] => string (19) "декабрь 2009"
    ["message_html"] => string(100) "<p>text</p>"
    ["_xfRelativeResolver"] => String (41) "<servername>/rs/gazeta.89/add-version"
    ["Attachment_hash"] => string (32) "b9c95f3f74946d70c02fce5c8ef05234"
    ["_xfToken"] => String (8) "********"
    ["_xfRequestUri"] => String (25) "/ rs/gazeta.89/add-version"
    ["_xfNoRedirect"] => String (1) "1"
    ["_xfResponseType"] => String (4) "json"
  }
}
 

Alien

Well-known member
#3
To the best of my knowledge, this could be related to an add-on.

I do not see a /library/DoublePostings directory included in the core software.