diff --git a/README.md b/README.md
index 15d44f4..eb511b0 100644
--- a/README.md
+++ b/README.md
@@ -20,8 +20,6 @@ Alternatively, you can also manually install the node permanently into your embe
 npm install node-red-contrib-prometheus-exporter
 ```
 
-*Note: Until we have officially released the library, it needs to be installed via downloading this repository into your project.*
-
 ## How to use
 
 ### Configure a metric
diff --git a/package.json b/package.json
index c188d0c..61241a6 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "node-red-contrib-prometheus-exporter",
-  "version": "1.0.0",
+  "version": "1.0.1",
   "description": "A NodeRED node which allows exporting Prometheus metrics from within flows.",
   "keywords": ["node-red", "prometheus", "telegraf"],
   "main": "index.js",
diff --git a/prometheus-exporter/prometheus-exporter.js b/prometheus-exporter/prometheus-exporter.js
index f325af2..1470a08 100644
--- a/prometheus-exporter/prometheus-exporter.js
+++ b/prometheus-exporter/prometheus-exporter.js
@@ -36,13 +36,17 @@ module.exports = function (RED) {
             metricOp = DEFAULT_OPS[this.metricConfig.mtype];
           }
           // apply specific value
-          if (Number.isInteger(msg.payload.val)) {
-            metricVal = msg.payload.val;
-          } else {
+          if (msg.payload.val === undefined || msg.payload.val === null) {
             // no value is only allowed for counter
             if (this.metricConfig.mtype !== 'counter') {
               done('Missing val for metric type ' + this.metricConfig.mtype);
             }
+          } else {
+            if (isNaN(Number(msg.payload.val))) {
+              done('Invalid val for metric type ' + this.metricConfig.mtype);
+            } else {
+              metricVal = Number(msg.payload.val);
+            }
           }
           // apply labels
           if (msg.payload.labels) {