diff --git a/app/__init__.py b/app/__init__.py
index 8b2e2ce..fd530ca 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -187,6 +187,8 @@ def create_vehicle():
 
     if form.consumables.data:
         form.consumables.default = form.consumables.data
+    else:
+        form.consumables.default = []
 
     if form.validate_on_submit():
         if len(form.consumables.data) == 0: