diff --git a/src/DataSource/ArrayDataSource.php b/src/DataSource/ArrayDataSource.php
index f354f349..53a973cd 100644
--- a/src/DataSource/ArrayDataSource.php
+++ b/src/DataSource/ArrayDataSource.php
@@ -116,12 +116,11 @@ public function sort(Sorting $sorting): IDataSource
 			$data = [];
 
 			foreach ($this->data as $item) {
-				if (is_object($item->$column) && $item->$column instanceof \DateTimeInterface) {
-					$sort_by = $item->$column->format('Y-m-d H:i:s');
-				} elseif (is_object($item[$column]) && $item[$column] instanceof \DateTimeInterface) {
-					$sort_by = $item[$column]->format('Y-m-d H:i:s');
+				$value = is_object($item) ? $item->$column : $item[$column];
+				if ($value instanceof \DateTimeInterface) {
+					$sort_by = $value->format('Y-m-d H:i:s');
 				} else {
-					$sort_by = (string) $item[$column];
+					$sort_by = (string) $value;
 				}
 
 				$data[$sort_by][] = $item;