diff --git a/static/scripts/refull.js b/static/scripts/refull.js
index f6da95b..f5c3f73 100644
--- a/static/scripts/refull.js
+++ b/static/scripts/refull.js
@@ -97,7 +97,7 @@ window.addEventListener("load", function(evt) {
         }).then(r => {
             // console.log(r.data.Data)
             // console.log(r.data)
-            if(r.data.Data.SOURCE_SERIAL > 0 && r.data.Data.SOURCE_TCP > 0) {
+            if('SOURCE_SERIAL' in r.data.Data && r.data.Data.SOURCE_SERIAL.length > 0 && 'SOURCE_TCP' in r.data.Data && r.data.Data.SOURCE_TCP.length > 0) {
                 findSerialDataIndex(r.data.Data.SOURCE_TCP, r.data.Data.SOURCE_SERIAL)
             }
             if ('SOURCE_TCP' in r.data.Data && r.data.Data.SOURCE_TCP.length > 0) {
diff --git a/static/scripts/speedChart.js b/static/scripts/speedChart.js
index c496e73..3276644 100644
--- a/static/scripts/speedChart.js
+++ b/static/scripts/speedChart.js
@@ -112,4 +112,4 @@ function addTCPSpeedData(sensordataList) {
     speedChart.data.labels = times;
     speedChart.data.datasets[1].data = speedsTCP;
     speedChart.update();
-}
\ No newline at end of file
+}