diff --git a/android/app/src/main/java/com/eddy/atomrelay/UsbSerialTransport.kt b/android/app/src/main/java/com/eddy/atomrelay/UsbSerialTransport.kt
index 5f4988f..03dffaa 100644
--- a/android/app/src/main/java/com/eddy/atomrelay/UsbSerialTransport.kt
+++ b/android/app/src/main/java/com/eddy/atomrelay/UsbSerialTransport.kt
@@ -14,7 +14,7 @@ class UsbSerialTransport(
 
     override fun read(buffer: ByteArray, length: Int): Int {
         val n = connection.bulkTransfer(epIn, buffer, length, 5000)
-        if (n < 0) throw IOException("USB read failed")
+        if (n < 0) return 0
         return n
     }