diff --git a/Firmware/mmu.cpp b/Firmware/mmu.cpp
index 709da16ce..6433eafb5 100644
--- a/Firmware/mmu.cpp
+++ b/Firmware/mmu.cpp
@@ -553,8 +553,12 @@ void manage_response(bool move_axes, bool turn_off_nozzle, uint8_t move)
 		  response = mmu_get_response(move); //wait for "ok" from mmu
 		  if (!response) { //no "ok" was received in reserved time frame, user will fix the issue on mmu unit
 			  if (!mmu_print_saved) { //first occurence, we are saving current position, park print head in certain position and disable nozzle heater
-				  eeprom_update_byte((uint8_t*)EEPROM_MMU_FAIL, eeprom_read_byte((uint8_t*)EEPROM_MMU_FAIL) + 1);
-				  eeprom_update_word((uint16_t*)EEPROM_MMU_FAIL_TOT, eeprom_read_word((uint16_t*)EEPROM_MMU_FAIL_TOT) + 1);
+				  
+				  uint8_t mmu_fail = eeprom_read_byte((uint8_t*)EEPROM_MMU_FAIL);
+				  uint16_t mmu_fail_tot = eeprom_read_word((uint16_t*)EEPROM_MMU_FAIL_TOT);
+				  if(mmu_fail < 255) eeprom_update_byte((uint8_t*)EEPROM_MMU_FAIL, mmu_fail + 1);
+				  if(mmu_fail_tot < 65535) eeprom_update_word((uint16_t*)EEPROM_MMU_FAIL_TOT, mmu_fail_tot + 1);
+
 				  if (lcd_update_enabled) {
 					  lcd_update_was_enabled = true;
 					  lcd_update_enable(false);
@@ -1336,8 +1340,10 @@ void mmu_continue_loading()
 			manage_response(true, true, MMU_LOAD_MOVE);
 		}
 		if (PIN_GET(MMU_IDLER_SENSOR_PIN) != 0) {
-			eeprom_update_byte((uint8_t*)EEPROM_MMU_LOAD_FAIL, eeprom_read_byte((uint8_t*)EEPROM_MMU_LOAD_FAIL) + 1);
-			eeprom_update_word((uint16_t*)EEPROM_MMU_LOAD_FAIL_TOT, eeprom_read_word((uint16_t*)EEPROM_MMU_LOAD_FAIL_TOT) + 1);
+			uint8_t mmu_load_fail = eeprom_read_byte((uint8_t*)EEPROM_MMU_LOAD_FAIL);
+			uint16_t mmu_load_fail_tot = eeprom_read_word((uint16_t*)EEPROM_MMU_LOAD_FAIL_TOT);
+			if(mmu_load_fail < 255) eeprom_update_byte((uint8_t*)EEPROM_MMU_LOAD_FAIL, mmu_load_fail + 1);
+			if(mmu_load_fail_tot < 65535) eeprom_update_word((uint16_t*)EEPROM_MMU_LOAD_FAIL_TOT, mmu_load_fail_tot + 1);
 			char cmd[3];
 			//pause print, show error message and then repeat last T-code
 			stop_and_save_print_to_ram(0, 0);