FlammableComponent has an empty Damage field by default.

Prevents NRE exceptions when admemes are involved, etc?

Content.Server/Atmos/Components/FlammableComponent.cs

@@ -1,9 +1,4 @@
-using System.Collections.Generic;
-using Content.Server.Atmos.EntitySystems;
 using Content.Shared.Damage;
-using Robust.Shared.GameObjects;
-using Robust.Shared.Serialization.Manager.Attributes;
-using Robust.Shared.ViewVariables;
 
 namespace Content.Server.Atmos.Components
 {
@@ -32,6 +27,6 @@ namespace Content.Server.Atmos.Components
 
         [DataField("damage", required: true)]
         [ViewVariables(VVAccess.ReadWrite)]
-        public DamageSpecifier Damage = default!;
+        public DamageSpecifier Damage = new(); // Empty by default, we don't want any funny NREs.
     }
 }