diff --git a/HISTORY.md b/HISTORY.md
index c8102fe..159c424 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,5 +1,9 @@
 ## version history
 
+### 0.4.1
+- setting min value for co2 for investigating history gaps
+- anti-crash-fix for netatmo's current API problems
+
 ### 0.4.0
 - added wind-sensor (still testing)
 
diff --git a/accessory/eveatmo-room-accessory.js b/accessory/eveatmo-room-accessory.js
index a285493..aac83c5 100644
--- a/accessory/eveatmo-room-accessory.js
+++ b/accessory/eveatmo-room-accessory.js
@@ -79,6 +79,9 @@ module.exports = function(pHomebridge) {
 			var accessoryData = this.extractAccessoryData(deviceData);
 			var weatherData = this.mapAccessoryDataToWeatherData(accessoryData);
 
+            // testing, because it seems, that low co2 values cause gaps in history
+            weatherData["co2"] = Math.max(450,weatherData["co2"]);
+
             this.historyService.addEntry({
                 time: new Date().getTime() / 1000,
                 temp: weatherData["currentTemperature"],
diff --git a/accessory/eveatmo-weather-accessory.js b/accessory/eveatmo-weather-accessory.js
index bbd5362..51e4fda 100644
--- a/accessory/eveatmo-weather-accessory.js
+++ b/accessory/eveatmo-weather-accessory.js
@@ -22,7 +22,7 @@ module.exports = function(pHomebridge) {
 				if (!netatmoDevice.deviceData.hasOwnProperty(deviceId)) continue;
 				var device = netatmoDevice.deviceData[deviceId];
 				
-				if(device.dashboard_data.Pressure) {
+				if(device.dashboard_data && device.dashboard_data.Pressure) {
 					mainDeviceId = deviceId;
 				}
 			}
diff --git a/package.json b/package.json
index 57eb107..a6ba525 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "homebridge-eveatmo",
-	"version": "0.4.0",
+	"version": "0.4.1",
 	"description": "Homebridge plugin which adds a Netatmo weatherstation as HomeKit device and tries to act like Elgato Eve Room/Weather",
 	"license": "ISC",
 	"keywords": [