typeerror: ips\datetime::ts() argument #1 ($timestamp) must be of type int, null given

https://invisioncommunity.com/invision-community-5-bug-tracker/typeerror-ipsdatetimets-argument-1-timestamp-must-be-of-type-int-null-given-r797/

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Status: Moved to Github

TypeError: IPS\DateTime::ts(): Argument #1 ($timestamp) must be of type int, null given, called in public_html/applications/core/sources/Messenger/Conversation.php on line 211 (0)
#0 public_html/applications/core/sources/Messenger/Conversation.php(211): IPS\DateTime::ts()
#1 public_html/system/Content/Item.php(203): IPS\core\Messenger\Conversation::canCreate()
#2 public_html/applications/core/modules/front/messaging/messenger.php(540): IPS\Content\Item::create()
#3 public_html/system/Dispatcher/Controller.php(128): IPS\core\modules\front\messaging\messenger->compose()
#4 public_html/system/Content/Controller.php(124): IPS\Dispatcher\Controller->execute()
#5 public_html/applications/core/modules/front/messaging/messenger.php(97): IPS\Content\Controller->execute()
#6 public_html/system/Dispatcher/Dispatcher.php(169): IPS\core\modules\front\messaging\messenger->execute()
#7 public_html/index.php(16): IPS\Dispatcher->run()
#8 {main}

#0 public_html/init.php(827): IPS\Log::log()
#1 [internal function]: IPS\IPS::exceptionHandler()
#2 {main}

URL problem: messenger/compose/?to=1839&csrfKey=e9385ebe2024c27266c1d67f11d030de