diff --git a/op/op.ImportFS.php b/op/op.ImportFS.php
index e19389c66..73afdeed4 100644
--- a/op/op.ImportFS.php
+++ b/op/op.ImportFS.php
@@ -61,6 +61,7 @@ function getAttributeData($attrdef, $coldata, $objdata) { /* {{{ */
 function getCategoryData($colname, $coldata, $objdata) { /* {{{ */
 	global $catids;
 	$kk = explode(',', $coldata);
+	$objdata['category'][] = array();
 	foreach($kk as $k) {
 		if(isset($catids[$k]))
 			$objdata['category'][] = $catids[$k];