diff --git a/src/mars_patcher/mf/door_locks.py b/src/mars_patcher/mf/door_locks.py
index 102c19c..bbb82c5 100644
--- a/src/mars_patcher/mf/door_locks.py
+++ b/src/mars_patcher/mf/door_locks.py
@@ -125,17 +125,18 @@ def factory() -> dict:
         for door in range(256):
             door_addr = area_addr + door * 0xC
             door_properties = rom.read_8(door_addr)
-            door_type = DoorType(door_properties & 0xF)
 
             # Check if at end of list
             if door_properties == 0:
                 break
 
-            # Skip doors that mage marks as deleted
+            # Skip doors that mage or asm marks as deleted
             room = rom.read_8(door_addr + 1)
             if room == 0xFF:
                 continue
 
+            door_type = DoorType(door_properties & 0xF)
+
             # Skip excluded doors and doors that aren't lockable/open hatches
             lock = door_locks.get((area, door))
             if (area, door) in EXCLUDED_DOORS or door_type not in [