Action unexpected end of json input

[florian-lefebvre]

Astro Info

Astro                    v4.8.3
Node                     v18.18.0
System                   Linux (x64)
Package Manager          npm
Output                   server
Adapter                  @astrojs/node
Integrations             none

If this issue only occurs in one browser, which browser is a problem?

No response

Describe the Bug

When not returning anything from an action, it throws the following error: Unexpected end of JSON input

What's the expected result?

I expect it to return nothing without failing

Link to Minimal Reproducible Example

https://stackblitz.com/edit/github-rwthck?file=src%2Factions.ts,src%2Fpages%2Findex.astro

Participation

• I am willing to submit a pull request for this issue.