From 42208bc031aae9761d512183c554763df41a34cb Mon Sep 17 00:00:00 2001
From: Giuliano Zaro <3684609+GMagician@users.noreply.github.com>
Date: Sun, 16 Feb 2020 08:10:20 +0100
Subject: [PATCH] Fix unknown command on empty lines (#16867)

---
 Marlin/src/gcode/queue.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Marlin/src/gcode/queue.cpp b/Marlin/src/gcode/queue.cpp
index 4d0861c2b..eca6d5cb1 100644
--- a/Marlin/src/gcode/queue.cpp
+++ b/Marlin/src/gcode/queue.cpp
@@ -415,7 +415,7 @@ void GCodeQueue::get_serial_commands() {
 
       if (serial_char == '\n' || serial_char == '\r') {
 
-        process_line_done(serial_input_state[i], serial_line_buffer[i], serial_count[i]);
+        if (process_line_done(serial_input_state[i], serial_line_buffer[i], serial_count[i])) continue;
 
         char* command = serial_line_buffer[i];
 
@@ -550,7 +550,7 @@ void GCodeQueue::get_serial_commands() {
         else if (n < 0)
           SERIAL_ERROR_MSG(MSG_SD_ERR_READ);
 
-        process_line_done(sd_input_state, command_buffer[index_w], sd_count);
+        if (process_line_done(sd_input_state, command_buffer[index_w], sd_count)) continue;
 
         _commit_command(false);