[account42]

- You can try harder to reproduce it.

- You can extend logging to gather additional information to reproduce it.

- You can try to reason about the code and figure out possible causes.

- You can attempt to formally verify the correctness of the code.

- You can put guards into the code against unexpected states and actions.

- You can verify the correct result of previous actions before any destructive actions.

- If all fails you can scrap the piece of code in question since it seems to be beyond your ability to maintain.