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.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