tMod unexpectedly exits when (auto-)saving modded world data.

Title. has been happening within the past few days.
checking the

client.log

client.log

client.log

client.log shows that an Exception occurred upon Saving modded world data.
within the past few days that this is happening, it seems to happen randomly? as sometimes it does it within the first save, sometimes after multiple saves.

the error mentioned something about Cloud Save, so i disabled tMod's Steam Cloud. didn't work.
when the error happened earlier 1-2 days ago, androLib was mentioned in the error, so i disabled it. didn't work either.

client.log182.11KB

Natives.log1.56KB

environment-client.log3.92KB

Launch.log1.07KB

terrariasteamclient.log887B

cat•6/26/25, 1:41 PM

does it occur with no mods enabled?

Q-weh-ppyBossOP•6/26/25, 1:46 PM

uhhh... does Saving modded world data still happens with no mods enabled? do i need to create a new character and world?

cat•6/26/25, 1:54 PM

sure, make a new character and world

cat•6/26/25, 1:55 PM

the goal is to know whether saving data at all happens

Q-weh-ppyBossOP•6/26/25, 3:02 PM

well, leaving the game up for 50 minutes in a new world with a new character seems to be fine.
the game auto-saves every 10 minutes. and it does still says Saving modded world data in the log.

cat•6/26/25, 3:04 PM

is the error you had earlier on autosave?

cat•6/26/25, 3:04 PM

i would assume the issue is some mod you have

cat•6/26/25, 3:05 PM

what exactly did the "cloud save" error say?

cat•6/26/25, 3:06 PM

was it not about onedrive?

Q-weh-ppyBossOP•6/26/25, 3:06 PM

nope, not onedrive.

cat•6/26/25, 3:06 PM

okay

cat•6/26/25, 3:06 PM

then follow the flowchart until you find the mod causing the issue

Q-weh-ppyBossOP•6/26/25, 3:07 PM

uh, the error is in the

client.log

client.log

attached in this forum.

tModLoader•6/26/25, 3:07 PM

Tag: flowchart (Owner: jopojelly#0000)
Something weird happening in your game? Need to skip loading mods? Can't load a world or player? Do the following before asking for more help: https://cdn.discordapp.com/attachments/466247288331829249/481464717043564554/Untitled_Diagram1.png

QQ-weh-ppyBoss uh, the error is in the `client.log` attached in this forum.

Q-weh-ppyBossOP•6/26/25, 3:11 PM

the error in question:

[20:10:24.379] [.NET TP Worker/ERROR] [tML]: Unhandled Exception
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.Collections.Generic.Dictionary`2.Enumerator.MoveNext()
   at Terraria.ModLoader.IO.TileIO.SaveTileEntities() in tModLoader\Terraria\ModLoader\IO\TileIO_TEs.cs:line 18
   at Terraria.ModLoader.IO.WorldIO.Save(String path, Boolean isCloudSave) in tModLoader\Terraria\ModLoader\IO\WorldIO.cs:line 35
   at Terraria.IO.WorldFile.InternalSaveWorld(Boolean useCloudSaving, Boolean resetTime) in tModLoader\Terraria\IO\WorldFile.cs:line 712
   at Terraria.IO.WorldFile.<>c__DisplayClass58_0.<SaveWorld>b__0() in tModLoader\Terraria\IO\WorldFile.cs:line 642
   at Terraria.Utilities.FileUtilities.ProtectedInvoke(Action action) in tModLoader\Terraria\Utilities\FileUtilities.cs:line 207
   at Terraria.IO.WorldFile.SaveWorld(Boolean useCloudSaving, Boolean resetTime) in tModLoader\Terraria\IO\WorldFile.cs:line 641
   at Terraria.IO.WorldFile.SaveWorld() in tModLoader\Terraria\IO\WorldFile.cs:line 617
   at Terraria.WorldGen.saveAndPlayCallBack(Object threadContext) in tModLoader\Terraria\WorldGen.cs:line 2821
   at System.Threading.QueueUserWorkItemCallback.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()

[20:10:24.379] [.NET TP Worker/ERROR] [tML]: Unhandled Exception
System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
   at System.Collections.Generic.Dictionary`2.Enumerator.MoveNext()
   at Terraria.ModLoader.IO.TileIO.SaveTileEntities() in tModLoader\Terraria\ModLoader\IO\TileIO_TEs.cs:line 18
   at Terraria.ModLoader.IO.WorldIO.Save(String path, Boolean isCloudSave) in tModLoader\Terraria\ModLoader\IO\WorldIO.cs:line 35
   at Terraria.IO.WorldFile.InternalSaveWorld(Boolean useCloudSaving, Boolean resetTime) in tModLoader\Terraria\IO\WorldFile.cs:line 712
   at Terraria.IO.WorldFile.<>c__DisplayClass58_0.<SaveWorld>b__0() in tModLoader\Terraria\IO\WorldFile.cs:line 642
   at Terraria.Utilities.FileUtilities.ProtectedInvoke(Action action) in tModLoader\Terraria\Utilities\FileUtilities.cs:line 207
   at Terraria.IO.WorldFile.SaveWorld(Boolean useCloudSaving, Boolean resetTime) in tModLoader\Terraria\IO\WorldFile.cs:line 641
   at Terraria.IO.WorldFile.SaveWorld() in tModLoader\Terraria\IO\WorldFile.cs:line 617
   at Terraria.WorldGen.saveAndPlayCallBack(Object threadContext) in tModLoader\Terraria\WorldGen.cs:line 2821
   at System.Threading.QueueUserWorkItemCallback.Execute()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()

cat•6/26/25, 3:48 PM

follow the flowchart above

jopojelly•6/26/25, 7:59 PM

This particular issue is a result of a mod modifying TileEntities while the game is saving. It's a bit hard to diagnose since it can be random, but if you can narrow it down to a mod that would help. (TileEntities are special tiles that hold data or seem to be running logic constantly)

Most likely the culprit, if it happens frequently, is some mod that is placing or removing tiles in some automated manner.

Q-weh-ppyBossOP•6/26/25, 8:11 PM

uh, what's an example of a TileEntity? like, chests?

jopojelly•6/26/25, 8:15 PM

Chests are technically not, but hat rack, food platter, logic sensor, mannequins, those are tile entities. Your error happened during saving modded tile entities, however, so that's up to what each mod is doing

Q-weh-ppyBossOP•6/26/25, 8:47 PM

does world gen generate TileEntities?

jopojelly•6/26/25, 8:50 PM

normal world gen probably wouldn't, but mods can add whatever they want

[20:10:24.379] [.NET TP Worker/ERROR] [tML]: Unhandled Exception System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.Collections.Generic.Dictionary`2.Enumerator.MoveNext() at Terraria.ModLoader.IO.TileIO.SaveTileEntities() in tModLoader\Terraria\ModLoader\IO\TileIO_TEs.cs:line 18 at Terraria.ModLoader.IO.WorldIO.Save(String path, Boolean isCloudSave) in tModLoader\Terraria\ModLoader\IO\WorldIO.cs:line 35 at Terraria.IO.WorldFile.InternalSaveWorld(Boolean useCloudSaving, Boolean resetTime) in tModLoader\Terraria\IO\WorldFile.cs:line 712 at Terraria.IO.WorldFile.<>c__DisplayClass58_0.<SaveWorld>b__0() in tModLoader\Terraria\IO\WorldFile.cs:line 642 at Terraria.Utilities.FileUtilities.ProtectedInvoke(Action action) in tModLoader\Terraria\Utilities\FileUtilities.cs:line 207 at Terraria.IO.WorldFile.SaveWorld(Boolean useCloudSaving, Boolean resetTime) in tModLoader\Terraria\IO\WorldFile.cs:line 641 at Terraria.IO.WorldFile.SaveWorld() in tModLoader\Terraria\IO\WorldFile.cs:line 617 at Terraria.WorldGen.saveAndPlayCallBack(Object threadContext) in tModLoader\Terraria\WorldGen.cs:line 2821 at System.Threading.QueueUserWorkItemCallback.Execute() at System.Threading.ThreadPoolWorkQueue.Dispatch() at System.Threading.PortableThreadPool.WorkerThread.WorkerThreadStart()

tMod unexpectedly exits when (auto-)saving modded world data.

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