From 2e1939e85c7f4a796b58456abe189765addd8b7d Mon Sep 17 00:00:00 2001
From: Giuliano <3684609+GMagician@users.noreply.github.com>
Date: Sat, 28 Apr 2018 00:40:27 +0200
Subject: [PATCH] [2.0.x] report error on unsupported commands (#10553)

Raise an error when an unknown/unsupported G/M command is requires.

This will address #10546
---
 Marlin/src/gcode/gcode.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Marlin/src/gcode/gcode.cpp b/Marlin/src/gcode/gcode.cpp
index 4416425270..3a24f62479 100644
--- a/Marlin/src/gcode/gcode.cpp
+++ b/Marlin/src/gcode/gcode.cpp
@@ -277,6 +277,8 @@ void GcodeSuite::process_parsed_command(
       #if ENABLED(DEBUG_GCODE_PARSER)
         case 800: parser.debug(); break;                          // G800: GCode Parser Test for G
       #endif
+
+      default: parser.unknown_command_error(); break;
     }
     break;
 
@@ -655,6 +657,8 @@ void GcodeSuite::process_parsed_command(
       #endif
 
       case 999: M999(); break;                                    // M999: Restart after being Stopped
+
+      default: parser.unknown_command_error(); break;
     }
     break;