Fallout 1: Error Crash When Entering/Exiting Cell

You may receive several errors in relation to loading saves or entering new/old area cells, which leads to a crash and some form of error window similar to,
"The instruction at 00000011 referenced memory at 00000011
The memory could not be read from
Click OK to terminate the application
OK"

Here is a guide of the method I used to fix my error.
I stumbled upon this fix myself accidentally and never had an issue since doing this.

Further Explanation

Basically an error can be an issue with save files being overwritten and then data in those consequent save folders clashing, (I use the term, "can be," due to not being certain on what errors it can fix, whether it will actually successfully help you etc.)

Three other things to mention are:
- I was playing this in January, 2019, three months ago, so my memory could be wrong, but I decided a guide would be good as I saw it mentioned recently by someone and told them my fix.
- I was playing using FalloutFIXT mod with only vanilla assets enabled
- I tweaked my game folder to allow FIXT to register game time on Steam
These may or may not contribute to this guide being right for you and your specific issue.

I have specifically made this walk through as friendly as possible to anyone who knows nothing about navigating game folders on their hard drive.

Disclaimer:
This seemed to help me. It may not help you.
I am not responsible for any issues relating to you reading/imitating this guide. Do not follow this guide if you are not willing to have potential major errors with your save files or game files.

TL;DR/Confident People Follow This

Go into your Fallout 1 folder and GAMEDATA.
Now delete all files in the SAVEDATA>SLOT01-09 folders for each slot EXCEPT the one you wish to keep for where you are currently up to.
Abbreviated area names are what the files are named after so you will know where you are.
Continue on with your save.

FULL EXPLANATION Where the Save Files Are Located

1. Go To Your Library

2. Right click on "Fallout 1" on your list and select, "Properties," at the bottom of the list.

3. Left click on properties and then select, "Browse Local Files..."

4. Click the folder named, "DATA"

5. Go in to folder, "SAVEGAME"

6. Here you see all the save slots.

7. This is an example of your save files in the folder, "SLOT01," which represents save file 1, or the save file at the top of the list within the game.
On a sidenote, the reason the save files seem to have a L4D2 image may be due to me having deleted the game previously, but not the save files that stayed within the large Steam folder.

Deleting Excess Data

As you can see, there are a multitude of game files with abbreviated lettering.
The first few are:
- BROHD12
- CAVES
- CHILDRN1
Etc.
These signify area cells within the game.
For example, LAADYTUM relates to a save file you made with the Adytum city cell, which is located within LA in the game world.

As you can see, this shows the game keeps a stock of your save files, and does not just wipe/overwrite the older ones.
All folders, "SLOT01,", "SLOT 02," etc., are like this.

As an example, I want to delete all files except, "BROHD12," which is the most recent one or more the area you know you are currently at where your savefile is glitching/crashing.
Simply use your mouse, ctrl, or shift click function to select all other files and use the del, (delete,) button on your keyboard to delete them in to your recycle bin.
Do not empty the recycle bin just yet. As long as they are no longer in this folder they will not conflict. It will ease your stress of accidentally deleting the wrong save too. Backup files are an even better idea.

Your folder should now look like this:

You are done here and can close these folders.

Your Save Should Now Work

- Your save file should now work properly. If not, this fix does not work for you.

NOTES:
- Keep in mind cloud save file functions can interfere and replace files etc.
- A good way to ensure this does not work is to keep your folders neat always and delete excess save files every session.

Areas this glitch is common in are:
- The Glow
- The Cathedral
- Mariposa Military Base

Please let me know if you need any more help, clarification or for me to update or make sections clearer.
It is very hard to replicate these errors, especially once fixed, so there may be mistakes within this guide or it may not work for you the first time etc.

Fallout 1 Advice
I have played through Fallout 1 fully and I am happy to give advice there too.

FalloutFIXT
If you want Fallout 1 to run with FIXT and contribute to your Steam playtime there is a fantastic guide in the forums to do that, as well as get FIXT to begin with. I have followed those two guides well and recommend them.

[Arnie Rimsy BSc.SSc.]

Well at least you know the way to play now so it should not take too long to get back there.

Think of it as a fresh start, a new character and story.

[Dumah]

Fck it. I will just restart whole game. I just realised that good endings for Hub and Followers will be unreachable because i did not edited invasion limits. Considering that i started whole this playthrough in order to get those good endings this all was just a waste of time.

Thx for help anyway.

[Arnie Rimsy BSc.SSc.]

Its really hard to help because I don't kboq what you have and haven't done ams if my fix will even help.

You are deleting every area except the most reason ones in all ten save slots yeah? You can also just flatout delete them all except the very latest uncorrupt one and then just start fresh with saves. I fully recommend doing so to the point where you make new uncorrupted saves and then leave the game and delete that one single save you made too so now all your saves will be completely new.

[Dumah]

Welp, getting to Hubs downtown was only a part of the problem. Getting out of the Hub was the other. After going to Hub entrance game just died. Even ctrl-alt-del did not helped because mouse stopped responding. More so when i attempted to return to Adytum, after another save switcheroo canibalism, it also glitched out. Now it looks like all zones that i visit are immedeatly get corrupted for some reason.

[Dumah]

Il probably just try to cannibalize other saves for working zones. Im almost finished game anyway, only Boneyard and Cathedral are left to explore.

[Arnie Rimsy BSc.SSc.]

Well I can only think that its a difference in patch. I used FIXT but with full vanilla friendly settings and no extra content anwyay.

If it was easy to do it say send me your save and I'd try fix it but I can't do that with different files etc.

[Dumah]

Nope. First i removed all saves but one ( 6 out of 7 ). It did not worked. Than i opened this last save and removed Hub downtown map. Save simply died. Than i tried to change map save from other save file... it worked but obviously all progress in that zone was reset. This is wierd as fuck.

Still cant understand how the fuck i managed to play in FO1 and 2 back in the day without EVER encountering those problems...

As i said it literally looks like game is dying at my hands with each next step.

Im using vanilla patched with teamX patches, child restoration patch and Sduibek endings restoration mod/patch. This pretty much should be roughly equal to Sduibek Fixt light install.

[Arnie Rimsy BSc.SSc.]

Please tell me you didn't delete anything from any folder other than "SAVEGAME"?
That would be an issue with deleting game data.

[Arnie Rimsy BSc.SSc.]

I'm guessing you did what I said not to do; deleted the main save for that folder.

Are you using vanilla?
FIXT?
And I am guessing you didn't also empty your recycling bin? Restore, trial and error.

Also, another thing: this may not work for you at all as I don't know the full parameters and why it even worked for me. I just tried it and it worked.

For more reference, my two loading cell issues were at Mariposa entrance and in LA at the church.

My theory was:
There are so many wannabe saves in your folder that it becomes confused and then crashes. Removing all files but the newest one seemed to help me.

Hope you get it working so you can play this crusty old great game.

[Dumah]

Hm... as soon as i deleted one of map saves save file simply stopped working at all. Can you ellaborate a bit more on what to do?

Cant finish game at all, it looks like it dies right before my eyes... god knows how i managed to finish it back in the day.