diff --git a/lihzahrd/world.py b/lihzahrd/world.py
index a3ee400..608b08a 100644
--- a/lihzahrd/world.py
+++ b/lihzahrd/world.py
@@ -378,9 +378,21 @@ class World:
 
         rain = Rain(is_active=f.bool(), time_left=f.int4(), max_rain=f.single())
 
-        hardmode_ore_1 = HardmodeTier1Ore(f.int4())
-        hardmode_ore_2 = HardmodeTier2Ore(f.int4())
-        hardmode_ore_3 = HardmodeTier3Ore(f.int4())
+        try:
+            hardmode_ore_1 = HardmodeTier1Ore(f.int4())
+        except ValueError:
+            hardmode_ore_1 = HardmodeTier1Ore.NOT_DETERMINED
+
+        try:
+            hardmode_ore_2 = HardmodeTier2Ore(f.int4())
+        except ValueError:
+            hardmode_ore_2 = HardmodeTier2Ore.NOT_DETERMINED
+
+        try:
+            hardmode_ore_3 = HardmodeTier3Ore(f.int4())
+        except ValueError:
+            hardmode_ore_3 = HardmodeTier3Ore.NOT_DETERMINED
+
         altars_smashed = AltarsSmashed(count=smashed_altars_count,
                                        ore_tier1=hardmode_ore_1,
                                        ore_tier2=hardmode_ore_2,