diff --git a/src/Versioned.php b/src/Versioned.php
index 087fc298..e96f1345 100644
--- a/src/Versioned.php
+++ b/src/Versioned.php
@@ -19,6 +19,7 @@
 use SilverStripe\ORM\DataList;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DataQuery;
+use SilverStripe\ORM\DataQuery_SubGroup;
 use SilverStripe\ORM\DB;
 use SilverStripe\ORM\FieldType\DBDatetime;
 use SilverStripe\ORM\Queries\SQLSelect;
@@ -655,6 +656,9 @@ protected function prepareMaxVersionSubSelect(SQLSelect $baseQuery, DataQuery $d
         // We can ONLY promote a filter on the primary key of the base table. Any other conditions will make the
         // version returned incorrect, as we are filtering out version that may be the latest (and correct) version
         foreach ($baseQuery->getWhere() as $condition) {
+            if (is_object($condition)) {
+                continue;
+            }
             $conditionClause = key($condition);
             // Pull out the table and field for this condition. We'll skip anything we can't parse
             if (preg_match('/^"([^"]+)"\."([^"]+)"/', $conditionClause, $matches) !== 1) {