diff --git a/game/ato/loadouts.py b/game/ato/loadouts.py
index 442be6b6..0038227a 100644
--- a/game/ato/loadouts.py
+++ b/game/ato/loadouts.py
@@ -1,8 +1,9 @@
 from __future__ import annotations
 
 import datetime
+import logging
 from collections.abc import Iterable
-from typing import Iterator, Mapping, Optional, TYPE_CHECKING, Type
+from typing import Iterator, Mapping, Optional, TYPE_CHECKING, Type, Dict, Any
 
 from dcs.unittype import FlyingType
 
@@ -120,6 +121,10 @@ class Loadout:
         # }
         payloads = aircraft.dcs_unit_type.load_payloads()
         for payload in payloads.values():
+            if not cls.valid_payload(payload["pylons"]):
+                msg = f'Incompatible loadout for {aircraft} skipped: {payload["name"]}'
+                logging.warning(msg)
+                continue
             name = payload["name"]
             pylons = payload["pylons"]
             yield Loadout(
@@ -128,6 +133,13 @@ class Loadout:
                 date=None,
             )
 
+    @staticmethod
+    def valid_payload(pylons: Dict[int, Dict[str, str]]) -> bool:
+        for p in pylons.values():
+            if Weapon.with_clsid(p["CLSID"]) is None:
+                return False
+        return True
+
     @classmethod
     def default_loadout_names_for(cls, task: FlightType) -> Iterator[str]:
         # This is a list of mappings from the FlightType of a Flight to the type of
@@ -189,6 +201,12 @@ class Loadout:
             dcs_unit_type.load_payloads()
             payload = dcs_unit_type.loadout_by_name(name)
             if payload is not None:
+                pylons = {i: {"CLSID": d["clsid"]} for i, d in payload}
+                if not cls.valid_payload(pylons):
+                    aircraft = dcs_unit_type.id
+                    msg = f"Incompatible loadout for {aircraft} skipped: {name}"
+                    logging.warning(msg)
+                    continue
                 return Loadout(
                     name,
                     {i: Weapon.with_clsid(d["clsid"]) for i, d in payload},
diff --git a/game/data/weapons.py b/game/data/weapons.py
index 23db497d..5333a66e 100644
--- a/game/data/weapons.py
+++ b/game/data/weapons.py
@@ -53,8 +53,9 @@ class Weapon:
     def __setstate__(self, state: dict[str, Any]) -> None:
         # Update any existing models with new data on load.
         updated = Weapon.with_clsid(state["clsid"])
-        state.update(updated.__dict__)
-        self.__dict__.update(state)
+        if updated is not None:
+            state.update(updated.__dict__)
+            self.__dict__.update(state)
 
     @classmethod
     def register(cls, weapon: Weapon) -> None:
@@ -67,10 +68,10 @@ class Weapon:
         cls._by_clsid[weapon.clsid] = weapon
 
     @classmethod
-    def with_clsid(cls, clsid: str) -> Weapon:
+    def with_clsid(cls, clsid: str) -> Optional[Weapon]:
         if not cls._loaded:
             cls._load_all()
-        return cls._by_clsid[clsid]
+        return cls._by_clsid.get(clsid)
 
     @classmethod
     def _load_all(cls) -> None:
@@ -267,7 +268,9 @@ class Pylon:
                 pylon_number, weapon = value
                 if pylon_number != number:
                     continue
-                allowed.add(Weapon.with_clsid(weapon["clsid"]))
+                allowed_weapon = Weapon.with_clsid(weapon["clsid"])
+                if allowed_weapon is not None:
+                    allowed.add(allowed_weapon)
 
         return cls(number, allowed)