diff --git a/pyproject.toml b/pyproject.toml
index 81b710f..ec41df0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "starrail_damage_cal"
-version = "1.5.4"
+version = "1.5.5"
 description = "For StarRail Role Damage Cal"
 authors = [
     {name = "qwerdvd", email = "105906879+qwerdvd@users.noreply.github.com"},
diff --git a/starrail_damage_cal/damage/AvatarDamage/AvatarDamage.py b/starrail_damage_cal/damage/AvatarDamage/AvatarDamage.py
index 37eac0b..7f2ece9 100644
--- a/starrail_damage_cal/damage/AvatarDamage/AvatarDamage.py
+++ b/starrail_damage_cal/damage/AvatarDamage/AvatarDamage.py
@@ -2291,10 +2291,9 @@ class Mar7th(BaseAvatar):
             self.avatar_level,
         )
         if self.avatar_rank >= 4:
-            defence = (
-                base_attr["defence"] * (1 + attribute_bonus["DefenceAddedRatio"])
-                + attribute_bonus["DefenceDelta"]
-            )
+            defence = base_attr.get("defence", 0) * (
+                1 + attribute_bonus.get("DefenceAddedRatio", 0)
+            ) + attribute_bonus.get("DefenceDelta", 0)
             damage_add = defence * 0.3
             damagelist4[0] += damage_add
             damagelist4[1] += damage_add