diff --git a/can/can.ino b/can/can.ino
index 608b773..1db0c89 100644
--- a/can/can.ino
+++ b/can/can.ino
@@ -57,14 +57,20 @@ void loop() {
 
     switch (rxId) {
       case 0x382 : {
-        rpm = buf[0] | (buf[1] << 8);
-        v = rpm * 0.017;
-        Serial.println(v);
+        if (len >= 2) {
+          rpm = buf[0] | (buf[1] << 8);
+          v = rpm * 0.017;
+          Serial.println(v);
+        };
+        break;
       }
       case 0x209 : {
-        ubat = buf[0] | (buf[1] << 8);
-        ubatr = ubat / 16;
-        Serial.println(ubatr);
+        if (len >= 2) {
+          ubat = buf[0] | (buf[1] << 8);
+          ubatr = ubat / 16;
+          Serial.println(ubatr);
+        };
+        break;
       }
     }
   }