From f3e5444d4767155f057e1cc7c5636d45b5add6d2 Mon Sep 17 00:00:00 2001
From: 3d-gussner <3d.gussner@gmail.com>
Date: Fri, 12 Jan 2024 13:41:55 +0100
Subject: [PATCH] M850 shows active sheet Prevent sheet being active if not
 initialized

---
 Firmware/Marlin_main.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/Firmware/Marlin_main.cpp b/Firmware/Marlin_main.cpp
index 74ac22d06..fbdd9d38e 100644
--- a/Firmware/Marlin_main.cpp
+++ b/Firmware/Marlin_main.cpp
@@ -7880,7 +7880,7 @@ Sigma_Exit:
     Get and Set Sheet parameters
     #### Usage
 
-         M25 [ S | Z | L | B | P | A ]
+         M850 [ S | Z | L | B | P | A ]
 
     #### Parameters
      - `S` - Sheet id [0-7]
@@ -7910,7 +7910,7 @@ Sigma_Exit:
 			break; // invalid sheet ID
 		}	
 	} else {
-		break;
+		iSel = eeprom_read_byte(&(EEPROM_Sheets_base->active_sheet));
 	}
 	
 	if (code_seen('Z')){
@@ -7967,7 +7967,11 @@ Sigma_Exit:
 	if (code_seen('A'))
 	{
 		bIsActive |= code_value_uint8() || (eeprom_read_byte(&(EEPROM_Sheets_base->active_sheet)) == iSel);
-		if(bIsActive) eeprom_update_byte(&EEPROM_Sheets_base->active_sheet, iSel);
+		if(bIsActive && eeprom_is_sheet_initialized(iSel)) {
+            eeprom_update_byte(&EEPROM_Sheets_base->active_sheet, iSel);
+        } else {
+            bIsActive = 0;
+        }
 	}
 	else
 	{