Compilation error

Author: zeleps

Marlin/src/lcd/menu/menu_advanced.cpp

@@ -253,6 +253,8 @@ void menu_backlash();
 //
 #if SHOW_MENU_ADVANCED_TEMPERATURE
 
+  #define HAS_MULTI_HOTEND 1
+
   #if ENABLED(MPC_EDIT_MENU)
     #define MPC_EDIT_DEFS(N) \
       MPC_t &c = thermalManager.temp_hotend[N].constants; \
@@ -351,7 +353,7 @@ void menu_backlash();
       #if ENABLED(MPC_INCLUDE_FAN)
         #define MPC_EDIT_ITEMS(N) \
           _MPC_EDIT_ITEMS(N); \
-          EDIT_ITEM_FAST_N(float43, N, MSG_MPC_AMBIENT_XFER_COEFF_FAN255_E, &editable.decimal, 0, 1, []{ \
+          EDIT_ITEM_FAST_N(float43, N, MSG_MPC_AMBIENT_XFER_COEFF_FAN255_E, &editable.decimal, 0, 1, [&]{ \
             c.fan255_adjustment = editable.decimal - c.ambient_xfer_coeff_fan0; \
           })
       #else