I was making a server world, so I made a teleportation pad (/tp command). I chose a random coordinate far from the spawn so no one would see it. So I built the best house that I have ever built, with a lockable door and everything. I was about to do a YouTube video about it. But then my Minecraft crashed. Every time I went on ANY world, including a new world it crashed. I'm on Windows 10 so I searched up if people had the same problem as me. They said to go back to 1.8.9. I did, and the command blocks reset so i lost the coordinates.
You should be able to access your logs through your minecraft files:
C:\Users\GiraRay\AppData\Roaming\ .minecraft\logs (remove the space in Roaming\ .minecraft !)
Here, you can see a list of winRAR files and txt. documents named after dates of every play session. Each file should contain everything displayed in the chat and every command executed, by cmd blocks and players.
Unless you remember when you built that house, it's going to be a pain to navigate the right file.