diff --git a/SqlBuilder.php b/SqlBuilder.php
index e486468..2aef870 100644
--- a/SqlBuilder.php
+++ b/SqlBuilder.php
@@ -284,9 +284,12 @@ class SqlBuilder extends Component
      * @param array $select
      * @return string
      */
-    private function makeSelect(array $select = ['*']): string
-    {
-        $select = "SELECT " . implode(',', $select) . " FROM " . $this->query;
+    private function makeSelect(mixed $select = ['*']): string
+    {
+        if (!is_array($select)) {
+            $select = ['*'];
+        }
+        $select = "SELECT " . implode(',', $select) . " FROM " . $this->query;
         if ($this->query != "") {
             $select .= " AS " . $this->query;
         }