diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionDetails.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionDetails.java
index 91b1f2c6..f683891b 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionDetails.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionDetails.java
@@ -11,6 +11,7 @@ package ch.ethz.seb.sebserver.gui.service.session;
 import java.util.Collection;
 import java.util.EnumMap;
 
+import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.widgets.Display;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -147,13 +148,17 @@ public class ClientConnectionDetails {
                 .forEach(indValue -> {
                     final IndicatorData indData = this.indicatorMapping.get(indValue.getType());
                     final double value = indValue.getValue();
-                    final int colorIndex = IndicatorData.getColorIndex(indData, value);
+
                     if (this.connectionData.clientConnection.status != ConnectionStatus.ESTABLISHED) {
                         form.setFieldValue(indData.indicator.name, Constants.EMPTY_NOTE);
                         form.setFieldColor(indData.indicator.name, indData.defaultColor);
                     } else {
+                        final int colorIndex = IndicatorData.getColorIndex(indData, value);
+                        final Color color = (colorIndex >= 0)
+                                ? indData.thresholdColor[colorIndex].color
+                                : indData.defaultColor;
                         form.setFieldValue(indData.indicator.name, String.valueOf(value));
-                        form.setFieldColor(indData.indicator.name, indData.thresholdColor[colorIndex].color);
+                        form.setFieldColor(indData.indicator.name, color);
                     }
                 });
     }
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionTable.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionTable.java
index 0e2201b9..44bce129 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionTable.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/ClientConnectionTable.java
@@ -22,6 +22,7 @@ import java.util.stream.Collectors;
 
 import org.apache.commons.lang3.StringUtils;
 import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Color;
 import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.layout.GridData;
 import org.eclipse.swt.layout.GridLayout;
@@ -321,11 +322,11 @@ public final class ClientConnectionTable {
                             indicatorData.index,
                             indicatorData.defaultColor);
                 } else {
-
                     tableItem.setText(indicatorData.index, getDisplayValue(indicatorValue));
-                    tableItem.setBackground(
-                            indicatorData.index,
-                            indicatorData.thresholdColor[this.thresholdColorIndices[i]].color);
+                    final Color color = (this.thresholdColorIndices[i] >= 0)
+                            ? indicatorData.thresholdColor[this.thresholdColorIndices[i]].color
+                            : indicatorData.defaultColor;
+                    tableItem.setBackground(indicatorData.index, color);
                 }
             }
         }
diff --git a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/IndicatorData.java b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/IndicatorData.java
index 8dbab22f..e21f9b7a 100644
--- a/src/main/java/ch/ethz/seb/sebserver/gui/service/session/IndicatorData.java
+++ b/src/main/java/ch/ethz/seb/sebserver/gui/service/session/IndicatorData.java
@@ -20,6 +20,7 @@ import ch.ethz.seb.sebserver.gbl.model.exam.Indicator.Threshold;
 import ch.ethz.seb.sebserver.gbl.util.Utils;
 
 final class IndicatorData {
+
     final int index;
     final Indicator indicator;
     final Color defaultColor;
@@ -51,12 +52,12 @@ final class IndicatorData {
 
     static final int getColorIndex(final IndicatorData indicatorData, final double value) {
         for (int j = 0; j < indicatorData.thresholdColor.length; j++) {
-            if (value < indicatorData.thresholdColor[j].value) {
+            if (value > indicatorData.thresholdColor[j].value && value < indicatorData.thresholdColor[j].value) {
                 return j;
             }
         }
 
-        return indicatorData.thresholdColor.length - 1;
+        return -1;
     }
 
     static final class ThresholdColor {