diff --git a/konova/views/map_proxy.py b/konova/views/map_proxy.py
index 6b6e386..d6ebe03 100644
--- a/konova/views/map_proxy.py
+++ b/konova/views/map_proxy.py
@@ -93,14 +93,23 @@ class ClientProxyParcelWFS(BaseClientProxyView):
         auth = HTTPDigestAuth(CLIENT_PROXY_AUTH_USER, CLIENT_PROXY_AUTH_PASSWORD)
 
         content, response_code = self.perform_url_call(url, auth=auth)
-        body = json.loads(content)
+        error_detected = response_code != 200
+        error_code = f"response code:{response_code}"
+        try:
+            body = json.loads(content)
+        except JSONDecodeError:
+            body = {}
+            error_code = "json invalid"
+            error_detected = True
+
         body["crs"] = {
             "type": "name",
             "properties": {
-                "name": "urn:ogc:def:crs:EPSG::25832"
+                "name": "urn:ogc:def:crs:EPSG::25832",
             }
         }
-        if response_code != 200:
+        if error_detected:
+            body["crs"]["properties"]["msg"] = f"Error detected ({error_code})"
             return JsonResponse({
                 "status_code": response_code,
                 "content": body,