diff --git a/openweather.js b/openweather.js
index 24f4ee3..d2e4c8e 100644
--- a/openweather.js
+++ b/openweather.js
@@ -114,16 +114,16 @@ function onDeltasUpdate(deltas) {
     if (deltas === null && !Array.isArray(deltas) && deltas.length === 0) {
         throw "Deltas cannot be null";
     }
+    if (deltas.updates && Array.isArray(deltas.updates))
+        deltas.updates.forEach(u => {
+            u.values.forEach((value) => {
+                let onDeltaUpdated = subscriptionHandler.find((d) => d.path === value.path);
 
-    deltas.updates.forEach(u => {
-        u.values.forEach((value) => {
-            let onDeltaUpdated = subscriptionHandler.find((d) => d.path === value.path);
-
-            if (onDeltaUpdated !== null) {
-                onDeltaUpdated.handle(value.value);
-            }
+                if (onDeltaUpdated !== null) {
+                    onDeltaUpdated.handle(value.value);
+                }
+            });
         });
-    });
 }
 
 function onPositionUpdate(value) {
diff --git a/package.json b/package.json
index 5befb2b..d307bda 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "openweather-signalk",
-  "version": "0.8.0",
+  "version": "0.8.1",
   "description": "SignalK plugin to provide data from OpenWeather Service",
   "main": "index.js",
   "scripts": {