diff --git a/spaceapi/state.py b/spaceapi/state.py
--- a/spaceapi/state.py
+++ b/spaceapi/state.py
@@ -2,7 +2,7 @@ import json
 
 from time import time
 
-from flask import Blueprint, jsonify, request, current_app
+from flask import Blueprint, jsonify, request, current_app, abort
 
 from .active import active_json, save_last_state
 from .auth import httpauth
@@ -33,4 +33,4 @@ def set_state(key):
         save_last_state()
         return jsonify(active_json)
     else:
-        return 400
+        return abort(400)