Index: t3lib/tree/tca/class.t3lib_tree_tca_databasetreedataprovider.php
===================================================================
--- t3lib/tree/tca/class.t3lib_tree_tca_databasetreedataprovider.php	(revision 9338)
+++ t3lib/tree/tca/class.t3lib_tree_tca_databasetreedataprovider.php	(working copy)
@@ -235,7 +235,7 @@
 			$node->setExpanded($this->isExpanded($basicNode));
 		}
 		$node->setSelectable(!t3lib_div::inList($this->getNonSelectableLevelList(), $level));
-		$node->setIcon(t3lib_iconWorks::mapRecordTypeToSpriteIconClass($this->tableName, $row));
+		$node->setIcon(t3lib_iconWorks::mapRecordTypeToSpriteIconClass($this->tableName, (array)$row));
 		$node->setId($basicNode->getId());
 		$node->setParentNode($parent);
 		if ($basicNode->hasChildNodes()) {