[acp] regen stats db-cache shows error "Illegal string offset"

Illegal string offset 'post_time' Call-trace:

/fws\error\handler.php in line 204 [ Method: FWS_Error_Handler::get_error_message() ]
/src\cache\source\stats.php in line 42 [ Method: FWS_Error_Handler::handle_error() ]
/fws\cache\content.php in line 78 [ Method: BS_Cache_Source_Stats::get_content() ]
/fws\cache\container.php in line 229 [ Method: FWS_Cache_Content::reload() ]
/fws\cache\container.php in line 169 [ Method: FWS_Cache_Container::reload() ]
/acp\module\dbcache\action_regenerate.php in line 49 [ Method: FWS_Cache_Container::refresh() ]
/fws\action\performer.php in line 277 [ Method: BS_ACP_Action_dbcache_regenerate::perform_action() ]
/fws\action\performer.php in line 240 [ Method: FWS_Action_Performer::perform_action_by_id() ]
/fws\document\renderer\html\default.php in line 309 [ Method: FWS_Action_Performer::perform_action() ]
/acp\src\renderer\content.php in line 187 [ Method: FWS_Document_Renderer_HTML_Default::perform_action() ]
/fws\document\renderer\html\default.php in line 375 [ Method: BS_ACP_Renderer_Content::header() ]
/fws\document.php in line 458 [ Method: FWS_Document_Renderer_HTML_Default::render() ]
/admin.php in line 55 [ Method: FWS_Document::render() ]

Illegal string offset 'edited_date' Call-trace:

/fws\error\handler.php in line 204 [ Method: FWS_Error_Handler::get_error_message() ]
/src\cache\source\stats.php in line 48 [ Method: FWS_Error_Handler::handle_error() ]
/fws\cache\content.php in line 78 [ Method: BS_Cache_Source_Stats::get_content() ]
/fws\cache\container.php in line 229 [ Method: FWS_Cache_Content::reload() ]
/fws\cache\container.php in line 169 [ Method: FWS_Cache_Container::reload() ]
/acp\module\dbcache\action_regenerate.php in line 49 [ Method: FWS_Cache_Container::refresh() ]
/fws\action\performer.php in line 277 [ Method: BS_ACP_Action_dbcache_regenerate::perform_action() ]
/fws\action\performer.php in line 240 [ Method: FWS_Action_Performer::perform_action_by_id() ]
/fws\document\renderer\html\default.php in line 309 [ Method: FWS_Action_Performer::perform_action() ]
/acp\src\renderer\content.php in line 187 [ Method: FWS_Document_Renderer_HTML_Default::perform_action() ]
/fws\document\renderer\html\default.php in line 375 [ Method: BS_ACP_Renderer_Content::header() ]
/fws\document.php in line 458 [ Method: FWS_Document_Renderer_HTML_Default::render() ]
/admin.php in line 55 [ Method: FWS_Document::render() ]

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