diff --git a/src/MySQL.php b/src/MySQL.php
index e62c7af..a22ef68 100644
--- a/src/MySQL.php
+++ b/src/MySQL.php
@@ -140,7 +140,7 @@
 			$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) {