I don't have a scav trader appear when I go into his room. I checked the room on a monk, a survivor and a gourmound. The survivor is fine, but the others are not. I also have an exceptionLog (game doesn't crash):

NullReferenceException: Object reference not set to an instance of an object
Scavenger.Violence (BodyChunk source, System.Nullable`1[T] directionAndMomentum, BodyChunk hitChunk, PhysicalObject+Appendage+Pos hitAppendage, Creature+DamageType type, System.Single damage, System.Single stunBonus) (at <1014ff9a5d9941ab9e645d4f5c9384a5>:0)
Explosion.Update (System.Boolean eu) (at <1014ff9a5d9941ab9e645d4f5c9384a5>:0)
Room.Update () (at <1014ff9a5d9941ab9e645d4f5c9384a5>:0)
DMD<Update>?452464896._RainWorldGame::Update (RainWorldGame this) (at <cb1b41a7a5a642dbac22ca348edef52b>:0)
DMD<>?452464896.Trampoline<RainWorldGame::Update>?271027200 (RainWorldGame ) (at <181d5a47cad64c1084b331a4891b930c>:0)
WhereSlugpupMod.WhereSlugpupMain.RainWorldGame_Update (On.RainWorldGame+orig_Update orig, RainWorldGame self) (at <033ac0337543475e9f90f54e512a9fe1>:0)
DMD<>?452464896.Hook<RainWorldGame::Update>?-782351872 (RainWorldGame ) (at <d1d0ab747b774c248badb3dac4fc3475>:0)
DMD<>?452464896.Trampoline<RainWorldGame::Update>?1815631872 (RainWorldGame ) (at <e026f88fe2a0470ba23b8ac8dd820568>:0)
RotundWorld.patch_Player.RainWorldGame_Update (On.RainWorldGame+orig_Update orig, RainWorldGame self) (at /RainWorldMods/WillowsMods/patch_Player.cs:681)
DMD<>?452464896.Hook<RainWorldGame::Update>?989859840 (RainWorldGame ) (at <a3142a2b527346c18332cb02737524a4>:0)
MainLoopProcess.RawUpdate (System.Single dt) (at <1014ff9a5d9941ab9e645d4f5c9384a5>:0)
RainWorldGame.RawUpdate (System.Single dt) (at <1014ff9a5d9941ab9e645d4f5c9384a5>:0)
DMD<>?452464896.Trampoline<RainWorldGame::RawUpdate>?-1500153344 (RainWorldGame , System.Single ) (at <8d94829ac5ba429fb3e1919b23ad7757>:0)
Pom.Pom.RainWorldGameRawUpdate (On.RainWorldGame+orig_RawUpdate orig, RainWorldGame self, System.Single dt) (at C:/Users/ericer/Documents/Rain World Documents/Code Modding/Pom/Pom/Pom.InputHooks.cs:41)
DMD<>?452464896.Hook<RainWorldGame::RawUpdate>?-925830144 (RainWorldGame , System.Single ) (at <b2ea0799baca4ca085bac0c6b9bb3fe0>:0)
DMD<Update>?452464896._ProcessManager::Update (ProcessManager this, System.Single deltaTime) (at <6749351a56e64d6bae0e31e945cd6d99>:0)
DMD<>?452464896.Trampoline<ProcessManager::Update>?-770667520 (ProcessManager , System.Single ) (at <ab29335c476940a185f8cadb040388f4>:0)
RegionKit.Modules.AnimatedDecals.VideoManager.ProcessManager_Update (On.ProcessManager+orig_Update orig, ProcessManager self, System.Single deltaTime) (at <d1b1d0fea65245628b796fb3fd75518e>:0)
DMD<>?452464896.Hook<ProcessManager::Update>?383768064 (ProcessManager , System.Single ) (at <24e966afae084d20a59638681974f00a>:0)
DMD<Update>?452464896._RainWorld::Update (RainWorld this) (at <c0955993540748e6bd5b22e0987cccfa>:0)
DMD<>?452464896.Trampoline<RainWorld::Update>?-633225216 (RainWorld ) (at <dd7d4b8746d847c29abe81b9c5c85aa9>:0)
ImprovedInput.Plugin.RainWorld_Update (On.RainWorld+orig_Update orig, RainWorld self) (at <b1532b580d2f4aa5a77966738074cad8>:0)
DMD<>?452464896.Hook<RainWorld::Update>?169659904 (RainWorld ) (at <fea7877f48ba4c17b826a5c39efc6806>:0)
DMD<>?452464896.Trampoline<RainWorld::Update>?2073619456 (RainWorld ) (at <e1799a5c48874885aee12f6140e11a43>:0)
Revivify.Plugin.ErrorCatch (On.RainWorld+orig_Update orig, RainWorld self) (at <84d6e4b45b0846db885a4a7bbcdd965b>:0)
DMD<>?452464896.Hook<RainWorld::Update>?-1016006144 (RainWorld ) (at <4c254c46eecc4dd6bd421c00631557b7>:0)
DMD<>?452464896.Trampoline<RainWorld::Update>?94789120 (RainWorld ) (at <6bffc51c40aa4427a20bd654eec0d35a>:0)
RainWorldTryCatch.RainWorldTryCatchPlugin.RainWorldUpdate (On.RainWorld+orig_Update orig, RainWorld self) (at <c8b27684357444569178699bdfe0f099>:0)
UnityEngine.Debug:LogException(Exception)
RainWorldTryCatch.RainWorldTryCatchPlugin:RainWorldUpdate(orig_Update, RainWorld)
DMD<>?452464896:Hook<RainWorld::Update>?-186876416(RainWorld)
DMD<>?452464896:Trampoline<RainWorld::Update>?-382948352(RainWorld)
Guardian.LogHooks:RainWorld_Update(orig_Update, RainWorld) (at E:/RainWorldModding/Guardian/src/plugin/Hooks/LogHooks.cs:70)
DMD<>?452464896:Hook<RainWorld::Update>?-1600600576(RainWorld)