diff --git a/static/scripts/refull.js b/static/scripts/refull.js
index a89d701..f6da95b 100644
--- a/static/scripts/refull.js
+++ b/static/scripts/refull.js
@@ -115,7 +115,7 @@ window.addEventListener("load", function(evt) {
 });
 
 function prepareForDistanceCalc(data) {
-    if('SOURCE_TCP' in data && data.SOURCE_TCP.length > 0 && 'SOURCE_SERIAL' in data) {
+    if('SOURCE_TCP' in data && data.SOURCE_TCP.length > 0 && 'SOURCE_SERIAL' in data && data.SOURCE_SERIAL.length > 0) {
         let sensorPoints = [];
         data.SOURCE_TCP.forEach(element => {
             if (element.Position[0] !== 0 && element.Position[1] !== 0) {
@@ -123,7 +123,6 @@ function prepareForDistanceCalc(data) {
                     differenceMs: Number.MAX_VALUE,
                     tcp: element,
                     ser: null,
-                    speed: null
                 })
             }
         })
@@ -151,7 +150,18 @@ function prepareForDistanceCalc(data) {
                     differenceMs: Number.MAX_VALUE,
                     tcp: null,
                     ser: element,
-                    speed: null
+                })
+            }
+        })
+        return sensorPoints
+    } else if ('SOURCE_TCP' in data && data.SOURCE_TCP.length > 0) {
+        let sensorPoints = [];
+        data.SOURCE_TCP.forEach(element => {
+            if (element.Position[0] !== 0 && element.Position[1] !== 0) {
+                sensorPoints.push({
+                    differenceMs: Number.MAX_VALUE,
+                    tcp: element,
+                    ser: null,
                 })
             }
         })