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@@ -281,7 +281,7 @@ void GCodeQueue::flush_and_request_resend(const serial_index_t serial_ind) {
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static bool serial_data_available(serial_index_t index) {
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const int a = SERIAL_IMPL.available(index);
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- #if BOTH(RX_BUFFER_MONITOR, RX_BUFFER_SIZE)
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+ #if ENABLED(RX_BUFFER_MONITOR) && RX_BUFFER_SIZE
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if (a > RX_BUFFER_SIZE - 2) {
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PORT_REDIRECT(SERIAL_PORTMASK(index));
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SERIAL_ERROR_MSG("RX BUF overflow, increase RX_BUFFER_SIZE: ", a);
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