diff --git a/src/MySQL.php b/src/MySQL.php
index f4b5c7d..2d4a937 100644
--- a/src/MySQL.php
+++ b/src/MySQL.php
@@ -146,7 +146,7 @@
 			$this->throw_if_no_table();
 
 			// Create array of columns from CSV
-			$columns = is_array($columns) ? $columns : explode(",", $columns);
+			$columns = is_array($columns) || is_null($columns) ? $columns : explode(",", $columns);
 
 			// Filter columns that aren't in the model if defiend
 			if ($columns && $this->model) {