diff --git a/src/components/widget-gauge.js b/src/components/widget-gauge.js
index be1ba9c..344fbbf 100644
--- a/src/components/widget-gauge.js
+++ b/src/components/widget-gauge.js
@@ -44,6 +44,8 @@ class WidgetGauge extends Component {
     
     // update value
     if (nextProps.data == null || nextProps.data[simulator] == null
+      || nextProps.data[simulator].output == null
+      || nextProps.data[simulator].output.values == null
       || nextProps.data[simulator].output.values.length === 0  
       || nextProps.data[simulator].output.values[0].length === 0) {
       this.setState({ value: 0 });
diff --git a/src/components/widget-lamp.js b/src/components/widget-lamp.js
index baefe98..2ed2f0e 100644
--- a/src/components/widget-lamp.js
+++ b/src/components/widget-lamp.js
@@ -42,7 +42,7 @@ class WidgetLamp extends Component {
     const simulator = nextProps.simulationModel.simulator;
 
     // update value
-    if (nextProps.data == null || nextProps.data[simulator] == null || nextProps.data[simulator].output.values == null) {
+    if (nextProps.data == null || nextProps.data[simulator] == null || nextProps.data[simulator].output == null || nextProps.data[simulator].output.values == null) {
       this.setState({ value: '' });
       return;
     }
diff --git a/src/components/widget-plot-table.js b/src/components/widget-plot-table.js
index 02d11be..9e9f353 100644
--- a/src/components/widget-plot-table.js
+++ b/src/components/widget-plot-table.js
@@ -103,7 +103,7 @@ class WidgetPlotTable extends Component {
     const simulator = this.props.simulationModel.simulator;
     let simulatorData = [];
 
-    if (this.props.data[simulator] != null) {
+    if (this.props.data[simulator] != null && this.props.data[simulator].output != null && this.props.data[simulator].output.values != null) {
       simulatorData = this.props.data[simulator].output.values.filter((values, index) => (
         this.props.widget.signals.findIndex(value => value === index) !== -1
       ));
diff --git a/src/components/widget-plot.js b/src/components/widget-plot.js
index 5ccfa5f..cb8271c 100644
--- a/src/components/widget-plot.js
+++ b/src/components/widget-plot.js
@@ -43,7 +43,7 @@ class WidgetPlot extends React.Component {
     const simulator = nextProps.simulationModel.simulator;
 
     // Proceed if a simulation with models and a simulator are available
-    if (simulator && nextProps.data[simulator] != null && nextProps.data[simulator] != null) {
+    if (simulator && nextProps.data[simulator] != null && nextProps.data[simulator] != null && nextProps.data[simulator].output != null && nextProps.data[simulator].output.values != null) {
       const chosenSignals = nextProps.widget.signals;
 
       const data = nextProps.data[simulator].output.values.filter((values, index) => (
diff --git a/src/components/widget-table.js b/src/components/widget-table.js
index 52d98d3..b266a23 100644
--- a/src/components/widget-table.js
+++ b/src/components/widget-table.js
@@ -46,7 +46,6 @@ class WidgetTable extends Component {
     if (nextProps.data == null
       || nextProps.data[simulator] == null
       || nextProps.data[simulator].output == null
-      || nextProps.data[simulator].output.length === 0 
       || nextProps.data[simulator].output.values.length === 0  
       || nextProps.data[simulator].output.values[0].length === 0) {
       // clear values
diff --git a/src/components/widget-value.js b/src/components/widget-value.js
index 2a5c765..aa056da 100644
--- a/src/components/widget-value.js
+++ b/src/components/widget-value.js
@@ -32,8 +32,15 @@ class WidgetValue extends Component {
   }
 
   componentWillReceiveProps(nextProps) {
+    if (nextProps.simulationModel == null) {
+      this.setState({ value: '' });
+      return;
+    }
+
+    const simulator = nextProps.simulationModel.simulator;
+
     // update value
-    if (nextProps.data == null || nextProps.simulationModel == null || nextProps.data[nextProps.simulationModel.simulator] == null || nextProps.data[nextProps.simulationModel.simulator].output == null || nextProps.data[nextProps.simulationModel.simulator].output.values == null) {
+    if (nextProps.data == null || nextProps.data[simulator] == null || nextProps.data[simulator].output == null || nextProps.data[simulator].output.values == null) {
       this.setState({ value: '' });
       return;
     }
@@ -41,7 +48,7 @@ class WidgetValue extends Component {
     const unit = nextProps.simulationModel.outputMapping[nextProps.widget.signal].type;
     
     // check if value has changed
-    const signal = nextProps.data[nextProps.simulationModel.simulator].output.values[nextProps.widget.signal];
+    const signal = nextProps.data[simulator].output.values[nextProps.widget.signal];
     if (signal != null && this.state.value !== signal[signal.length - 1].y) {
       this.setState({ value: signal[signal.length - 1].y, unit });
     }