diff --git a/src/Generator.php b/src/Generator.php
index 948eb92..a582200 100644
--- a/src/Generator.php
+++ b/src/Generator.php
@@ -54,9 +54,9 @@ class Generator
         // Find the drivers to add to the extra/interfaces
         $this->detectDrivers();
 
-        $this->extra = array_merge($this->extra, $this->config->get('ide-helper.extra'));
-        $this->magic = array_merge($this->magic, $this->config->get('ide-helper.magic'));
-        $this->interfaces = array_merge($this->interfaces, $this->config->get('ide-helper.interfaces'));
+        $this->extra = array_merge($this->extra, $this->config->get('ide-helper.extra'), []);
+        $this->magic = array_merge($this->magic, $this->config->get('ide-helper.magic'), []);
+        $this->interfaces = array_merge($this->interfaces, $this->config->get('ide-helper.interfaces'), []);
         // Make all interface classes absolute
         foreach ($this->interfaces as &$interface) {
             $interface = '\\' . ltrim($interface, '\\');