diff --git a/plugins/LaserUE.java b/plugins/LaserUE.java
index ff0c97e..925d34c 100644
--- a/plugins/LaserUE.java
+++ b/plugins/LaserUE.java
@@ -19,25 +19,30 @@ public class LaserUE extends SerialPortDevice{
     
     int value = 0;
     int count = 0;
+    
     @Override
     protected void onByte(int rx) {
         System.out.print(rx);
-        int index = ((rx&BIT7) > 0) ? 2 : (((rx&BIT6) > 0) ? 1 : 0);
-        if (count==index){
-            if (index ==0){
-                value = rx & 0x3F;
-            } else if (index ==1){
-                value =  ((rx& 0x3F)<<6) + value;
-            } else if (index ==2){
-                value =  ((rx& 0x0F)<<12) + value;
-                this.setCache(value);
-                count = 0;
-            } else {
+        if (rx < 0) {
+            count = 0;
+        } else {            
+            int index = ((rx&BIT7) > 0) ? 2 : (((rx&BIT6) > 0) ? 1 : 0);
+            if (count==index){
+                if (index ==0){
+                    value = rx & 0x3F;
+                } else if (index ==1){
+                    value =  ((rx& 0x3F)<<6) + value;
+                } else if (index ==2){
+                    value =  ((rx& 0x0F)<<12) + value;
+                    this.setCache(value);
+                    count = 0;
+                } else {
+                    count = 0;
+                }
+            }
+            else{
                 count = 0;
             }
         }
-        else{
-            count = 0;
-        }
     }    
 }