here's logs for the crash:

[00:49:54.439] [.NET TP Worker/WARN] [tML]: Silently Caught Exception:
System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.Utils.Width(Asset`1 asset)
at Terraria.NPC.SetDefaults(Int32 Type, NPCSpawnParams spawnparams)
at Terraria.ID.ContentSamples.Initialize()
at Terraria.ModLoader.ModContent.Unload()
at Terraria.ModLoader.ModLoader.Mods_Unload()
at Terraria.ModLoader.ModLoader.Unload()
at Terraria.ModLoader.ModLoader.Load(CancellationToken token)
at Terraria.ModLoader.ModLoader.<>c__DisplayClass47_0.<BeginLoad>b__0()
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.Tasks.Task.ExecuteWithThreadLocal(Task& currentTaskSlot, Thread threadPoolThread)
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()

[00:49:54.439] [.NET TP Worker/FATAL] [tML]: One or more errors occurred while unloading and tModLoader must be restarted to prevent further issues.
System.NullReferenceException: Object reference not set to an instance of an object.
at Terraria.Utils.Width(Asset`1 asset) in tModLoader\Terraria\Utils.cs:line 767
at Terraria.NPC.SetDefaults(Int32 Type, NPCSpawnParams spawnparams) in tModLoader\Terraria\NPC.cs:line 11368
at Terraria.ID.ContentSamples.Initialize() in tModLoader\Terraria\ID\ContentSamples.cs:line 824
at Terraria.ModLoader.ModContent.Unload() in tModLoader\Terraria\ModLoader\ModContent.cs:line 557
at Terraria.ModLoader.ModLoader.Mods_Unload() in tModLoader\Terraria\ModLoader\ModLoader.cs:line 262
at Terraria.ModLoader.ModLoader.Unload() in tModLoader\Terraria\ModLoader\ModLoader.cs:line 229
[00:49:56.809] [Main Thread/DEBUG] [TerrariaSteamClient]: Send: shutdown