diff --git a/app.py b/app.py
index 025c65b..2526adc 100644
--- a/app.py
+++ b/app.py
@@ -872,7 +872,7 @@ def cam_framesize():
     Der Server proxyt den Aufruf (Browser braucht keinen Direktzugriff)."""
     data = request.get_json(silent=True) or {}
     try:
-        val = int(data.get("val"))
+        val = int(str(data.get("val")))
     except (TypeError, ValueError):
         abort(400, description="val (int) erforderlich")
     if val not in FRAMESIZES: