diff --git a/wp-includes/wp-db.php b/wp-includes/wp-db.php
index c30b321935..09461f2bc6 100644
--- a/wp-includes/wp-db.php
+++ b/wp-includes/wp-db.php
@@ -310,9 +310,14 @@ class wpdb {
 		else
 			return null;
 
-		// Extract the column values
-		for ( $i=0; $i < count($this->last_result); $i++ ) {
-			$new_array[$i] = $this->get_var(null, $x, $i);
+		if ( !$this->last_result )
+			return null;
+
+		$i = 0;
+		foreach( $this->last_result as $row ) {
+			$arr = array_values( (array) $row );
+			$new_array[$i] =  $arr[0];
+			$i++;
 		}
 		return $new_array;
 	}