Can't delete a new part

server.py

@@ -119,6 +119,8 @@ def alter(partID):
 
 @app.route('/parts/delete/<partID>')
 def delete(partID):
+    if partID < 0:
+        abort(400)
     s = text('delete from parts where id=:id;')
     r = db_engine.execute(s, id=partID)
     return '{"status":"ok"}'

static/script.js

@@ -174,6 +174,8 @@ function text_filter(string) {
 }
 
 function delete_entry(partID) {
+	if (partID < 0)
+		return;
 	if (!confirm('Delete the selected entry?'))
 		return;
 	$.ajax({