Html export may be failing when trying to rewrite download links to files which are owned by someone other than the exporting user (files which are not going to be included in the export).
[WAR] 80 (artefact/file/lib.php:563) Trying to get property of non-object
Call stack (most recent first):
* log_message("Trying to get property of non-object", 8, true, true,
"/srv/sitename.com/public/htdocs/artefact/file/l...", 563) at /srv/sitename.com/public/htdocs/lib/errors.php:444
* error(8, "Trying to get property of non-object", "/srv/sitename.com/public/htdocs/artefact/file/l...", 563, array(size 3)) at /srv/sitename.com/public/htdocs/artefact/file/lib.php:563
* ArtefactTypeFileBase::get_full_path("357", false) at /srv/sitename.com/public/htdocs/export/html/lib.php:800
* HtmlExportOutputFilter->get_folder_path_for_file(object(ArtefactTypeFile)) at /srv/sitename.com/public/htdocs/export/html/lib.php:692
* HtmlExportOutputFilter->replace_artefact_link(array(size 6)) at Unknown:0
* preg_replace_callback("#<a[^>]+href="(http\\://sitename\\.com/)?/?view/...", array(size 2), "<div id="column_1" class="column columns3" style="...") at /srv/sitename.com/public/htdocs/export/html/lib.php:629
* HtmlExportOutputFilter->filter("<div id="column_1" class="column columns3" style="...") at /srv/sitename.com/public/htdocs/export/html/lib.php:376
* PluginExportHtml->dump_view_export_data() at /srv/sitename.com/public/htdocs/export/html/lib.php:198
* PluginExportHtml->export() at /srv/sitename.com/public/htdocs/export/download.php:102
....
PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 71 bytes) in /srv/sitename.com/public/htdocs/lib/htmlpurifier/HTMLPurifier/ChildDef/Required.php on line 25