Hey back, after some tries on Fastify with the Supertokens error handler, I can't achieve to make it work.. My server startup looks like: 1. Create a Fastify server instance 2. Load a Supertokens instance with init function 3. Load Supertokens error handler 4. Load everything else (all plugins and routes) But if the error handler is active and an error occur, I get an empty response body. Do you have any idea ? And do you need some part of my code to help ?