diff --git a/nodes/src/supervisor.c b/nodes/src/supervisor.c
index 555d50f..d1fd00a 100644
--- a/nodes/src/supervisor.c
+++ b/nodes/src/supervisor.c
@@ -31,6 +31,18 @@ enum error_code supervisor_run(){
         thermo_status = thermo_get_value(&thermo_value);
         window_status = window_get_value(&window_value);
         // todo : manage non-success error codes
+        if(success != co2_lvl_status){
+            co2_lvl_value = -1;
+        }else{}
+        if(success != hygro_status){
+            hygro_value = -1;
+        }else{}
+        if(success != thermo_status){
+            thermo_value = -1;
+        }else{}
+        if(success != window_status){
+            window_value = unknown;
+        }else{}
         ble_advertise(window_value, hygro_value, thermo_value, co2_lvl_value);
         if((co2_lvl_value > CO2_LEVEL_EMPTY_ROOM) || (window_value == open)){
             // there are people in the room, or someone forgot to close the window