diff --git a/src/message_processor.py b/src/message_processor.py
index 1662f62..3493c89 100644
--- a/src/message_processor.py
+++ b/src/message_processor.py
@@ -142,7 +142,13 @@ def process_high_temp(box_name, context, local_context, payload):
     return True
 
 def process_window(box_name, context, local_context, sub_key, payload):
-    local_context['window_state'][sub_key] = CONVERTERS["window_contact_input"][box["windows"][sub_key]["converter"]](payload)
+    // default converter
+    converter = lambda x:x
+    for sk in box["windows"]:
+        if sk["label"] == sub_key:
+            converter = CONVERTERS["window_contact_input"][sk["converter"]]
+            break
+    local_context['window_state'][sub_key] = converter(payload)
     _calculate_output_temperature(local_context)
     return True