Make your code error, but only sometimes!
Baby Language, 0 bytes

Try it online!
I knew this could be fun with a non-deterministic tarpit! I looked through the category on the Esolang wiki and found this language...
From the page:

A Baby Language interpreter ignores the input program and does something random. (Likewise, a Baby Language compiler generates a random executable.) As such, whatever you wanted your program to do, there's an (admittedly small) chance that it will actually do it.
The intended use case for the language is to run your program repeatedly until it does what you want. Just like trying to reason with a real baby, this may take quite a while.

So the blank program, and every program for that matter, executes a random program which will therefore randomly error!

Details on TIO link
I used Esolang user Enoua5's source code which generates and executes a random brainfuck program. It's linked on the Esolang page:

An interpreter created in Python 3 by User:Enoua5: View Source

So the TIO link above takes you to Python 3 interpreter is implemented in the header and the actual (blank) code is in the (blank) code slot, which is ignored anyway!
The above interpreter is simply copied and pasted into the header; a multiline comment starting/ending in the header/footer nullifies the actual code.