Trace log:

[0.0000] log started.
[0.0000] RH: creating DBAL
[0.0031] RH: creating TPL
[0.0041] RH: creating MSG
[0.0049] RH: constructor done
[0.0093] ERROR [!....]: DBAL [mysql] Error: Query failed: SELECT catalogue_products.*, catalogue_firms.name AS firm_name, catalogue_types.name AS type_name FROM catalogue_products LEFT JOIN catalogue_types ON (catalogue_types.type_id=catalogue_products.type_id) LEFT JOIN catalogue_firms ON (catalogue_firms.firm_id=catalogue_products.firm_id) WHERE catalogue_products.product_id= LIMIT 1 (You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'LIMIT 1' at line 1)
[0.0093] log flushed.

prematurely dying.