diff --git a/src/main/java/org/traccar/web/client/view/PositionInfoPopup.java b/src/main/java/org/traccar/web/client/view/PositionInfoPopup.java
index a4a004b6..550075d4 100644
--- a/src/main/java/org/traccar/web/client/view/PositionInfoPopup.java
+++ b/src/main/java/org/traccar/web/client/view/PositionInfoPopup.java
@@ -82,7 +82,10 @@ public void show(int x, int y, final Position position) {
                         parameterName = sensor.getName();
                         if (valueText.matches("^[-+]?\\d+(\\.\\d+)?$")) {
                             double value = Double.parseDouble(valueText);
-                            valueText = intervalText(value, SensorsEditor.intervals(sensor));
+                            List<SensorInterval> intervals = SensorsEditor.intervals(sensor);
+                            if (!intervals.isEmpty()) {
+                                valueText = intervalText(value, intervals);
+                            }
                         }
                     } else if (parameterName.equals("protocol")) {
                         parameterName = i18n.protocol();
diff --git a/src/main/webapp/m/js/traccar-mobile.js b/src/main/webapp/m/js/traccar-mobile.js
index 1f133399..82655eb1 100644
--- a/src/main/webapp/m/js/traccar-mobile.js
+++ b/src/main/webapp/m/js/traccar-mobile.js
@@ -456,15 +456,17 @@ function parseOther(position) {
                     name = sensor.name;
                     if (sensor.intervals != null && !isNaN(valueText)) {
                         var intervals = JSON.parse(sensor.intervals);
-                        var valueText = null;
-                        for (var j = 0; j < intervals.length; j++) {
-                            if (valueText == null) {
+                        if (intervals.length > 0) {
+                            var valueText = null;
+                            for (var j = 0; j < intervals.length; j++) {
+                                if (valueText == null) {
+                                    valueText = intervals[j].text;
+                                }
+                                if (value < intervals[j].value) {
+                                    break;
+                                }
                                 valueText = intervals[j].text;
                             }
-                            if (value < intervals[j].value) {
-                                break;
-                            }
-                            valueText = intervals[j].text;
                         }
                     }
                     break;