diff --git a/apps/informationscollector.py b/apps/informationscollector.py
index f92c0e7..242a5cc 100644
--- a/apps/informationscollector.py
+++ b/apps/informationscollector.py
@@ -62,7 +62,7 @@ class InformationsCollector(SmartObject):
             self.min_temp_yesterday_sensor = self.create_entity(output_sensors['min_temp_yesterday'])
 
             current_min_temp, current_max_temp = self.compute_min_max_temp()
-            if not self.max_temp_sensor.exists() or self.max_temp_sensor.get_state() == 'unavailable':
+            if not self.max_temp_sensor.exists() or self.max_temp_sensor.get_state() == 'unavailable' or self.max_temp_sensor.get_state() == 'unknown':
                 max_temp = current_max_temp
                 try:
                     if max_temp is None or self.dataset['max_temp'] > max_temp:
@@ -70,7 +70,7 @@ class InformationsCollector(SmartObject):
                         self.log_info(f"Restoring max_temp from dataset ({max_temp}°C)")
                 except KeyError: pass
                 self.set_max_temp_sensor(max_temp)
-            if not self.min_temp_sensor.exists() or self.min_temp_sensor.get_state() == 'unavailable':
+            if not self.min_temp_sensor.exists() or self.min_temp_sensor.get_state() == 'unavailable' or self.min_temp_sensor.get_state() == 'unknown':
                 min_temp = current_min_temp
                 try:
                     if min_temp is None or self.dataset['min_temp'] < min_temp:
@@ -199,8 +199,12 @@ class InformationsCollector(SmartObject):
         min_temp = None
         for sensor in self.args['min_max_temp_sensors']['temperature_sensors']:
             temp = self.get_state(sensor)
-            if not max_temp or temp > max_temp: max_temp = temp
-            if not min_temp or temp < min_temp: min_temp = temp
+            try:
+                temp = float(temp)
+            except (TypeError, ValueError):
+                continue
+            if max_temp is None or temp > max_temp: max_temp = temp
+            if min_temp is None or temp < min_temp: min_temp = temp
         return min_temp,max_temp
 
     def on_log_error(self, name, ts, level, type, message, kwargs):
@@ -224,10 +228,17 @@ class InformationsCollector(SmartObject):
 
     def on_temperature_change(self, entity, attribute, old, new, kwargs):
         if new != old:
+            
+            try:
+                new_value = float(new)    
+            except (TypeError, ValueError):
+                self.log_warning(f"Invalid temperature value from {entity}: {new}")
+                return
+
             min_temp = self.min_temp_sensor.get_state()
             max_temp = self.max_temp_sensor.get_state()
-            if max_temp is None or max_temp == 'unavailable' or new > max_temp: self.set_max_temp_sensor(new)
-            if min_temp is None or min_temp == 'unavailable' or new < min_temp: self.set_min_temp_sensor(new)
+            if max_temp is None or max_temp == 'unavailable' or new_value > float(max_temp): self.set_max_temp_sensor(new_value)
+            if min_temp is None or min_temp == 'unavailable' or new_value < float(min_temp): self.set_min_temp_sensor(new_value)
 
     def run_at_midnight(self, kwargs):
         self.max_temp_yesterday_sensor.set_state(state=self.max_temp_sensor.get_state(), attributes={'unit_of_measurement': '°C', 'device_class': 'temperature'})