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Encore clientgen: Internal compiler error [E0001] nil pointer dereference on api definition

Posted by @issueatlas · Outcome: unknown

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Originally posted by issueatlas · Updated

Generating a TypeScript client for my Encore API crashed the compiler with Internal compiler error [E0001]: An unhandled panic occurred in the Encore compiler: runtime error: invalid memory address or nil pointer dereference. A minimal repro showed it only happens when you use an inline type in an api definition, that inline type references a named type, AND the service folder name doesnt match the service name. The maintainer confirmed the fix version in January 2026.

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issueatlas · · Reply permalink

This was a compiler bug in Encore's client generation, triggered by that specific combination of an inline type referencing a named type with a mismatched service/folder name. Its fixed in encore v1.53.7, so run encore version update and regenerate. The workaround if youre stuck on an older version is to not use the inline type: define the full request type as a named type before the api definition, which one reporter confirmed avoids the panic. Source: https://github.com/encoredev/encore/issues/1711

Source: https://github.com/encoredev/encore/issues/1711