diff --git a/src/components/widget-gauge.js b/src/components/widget-gauge.js
index 6f5ac06..800f043 100644
--- a/src/components/widget-gauge.js
+++ b/src/components/widget-gauge.js
@@ -82,12 +82,14 @@ class WidgetGauge extends Component {
     const signal = nextProps.data[simulator.node][simulator.simulator].values[nextProps.widget.signal];
     // Take just 3 decimal positions
     // Note: Favor this method over Number.toFixed(n) in order to avoid a type conversion, since it returns a String
-    const new_value = Math.round( signal[signal.length - 1].y * 1e3 ) / 1e3;
-    if (this.state.value !== new_value) {
-      this.setState({ value: new_value });
+    if (signal != null) {
+      const new_value = Math.round( signal[signal.length - 1].y * 1e3 ) / 1e3;
+      if (this.state.value !== new_value) {
+        this.setState({ value: new_value });
 
-      // update gauge's value
-      this.gauge.set(new_value);
+        // update gauge's value
+        this.gauge.set(new_value);
+      }
     }
   }
 
@@ -102,7 +104,7 @@ class WidgetGauge extends Component {
 
     if (this.props.simulation) {
       var simulationModel = this.props.simulation.models.filter((model) => model.simulator.node === this.props.widget.simulator.node && model.simulator.simulator === this.props.widget.simulator.simulator)[0];
-      signalType = simulationModel && simulationModel.length > 0? simulationModel.mapping[this.props.widget.signal].type : '';
+      signalType = (simulationModel != null && simulationModel.length > 0) ? simulationModel.mapping[this.props.widget.signal].type : '';
     }
 
     return (