From bcf347403b13546e591e4f80cc06e61812049703 Mon Sep 17 00:00:00 2001
From: Luu Lac <45380455+shitcreek@users.noreply.github.com>
Date: Sat, 5 Jan 2019 14:01:35 -0600
Subject: [PATCH] Fix M106 extruder & fan count (#12820)

---
 Marlin/src/gcode/temperature/M106_M107.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Marlin/src/gcode/temperature/M106_M107.cpp b/Marlin/src/gcode/temperature/M106_M107.cpp
index 268a57d95f..5fcf465e70 100644
--- a/Marlin/src/gcode/temperature/M106_M107.cpp
+++ b/Marlin/src/gcode/temperature/M106_M107.cpp
@@ -47,7 +47,7 @@
  *           3-255 = Set the speed for use with T2
  */
 void GcodeSuite::M106() {
-  const uint8_t p = parser.byteval('P', active_extruder);
+  const uint8_t p = parser.byteval('P', MIN(active_extruder, FAN_COUNT - 1));
 
   if (p < MIN(EXTRUDERS, FAN_COUNT)) {
     uint16_t s = parser.ushortval('S', 255);