zellij-org/zellij · error · anyhow

Invalid NestedSessionHandling value

Error message

Invalid NestedSessionHandling value: {}

What it means

Error "Invalid NestedSessionHandling value: {}" thrown in zellij-org/zellij.

Solutions

1. Validate the value against the allowed enum range before constructing the message.
2. Ensure client and server use matching protobuf definitions; regenerate bindings if versions differ.

When it happens

Trigger: Occurs when a protobuf enum value received over IPC has no matching variant; conversion rejects the unknown value.

Common situations: Typical of version skew between client and server, or a malformed/corrupted IPC message.

AI-assisted analysis of zellij-org/zellij@e839bfffa5 (2026-08-28). Data as JSON: /api/errors/ec23ab9b2671c6d6. Report an issue: GitHub.

Appendix: source

Thrown at zellij-utils/src/ipc/protobuf_conversion.rs:1142

                        .map_err(|e| anyhow!(e))
                })
                .transpose()?,
            nested_session_handling: options
                .nested_session_handling
                .map(|n| match ProtoNestedSessionHandling::try_from(n).ok() {
                    Some(ProtoNestedSessionHandling::Ask) => {
                        Ok(crate::input::options::NestedSessionHandling::Ask)
                    },
                    Some(ProtoNestedSessionHandling::Fullscreen) => {
                        Ok(crate::input::options::NestedSessionHandling::Fullscreen)
                    },
                    Some(ProtoNestedSessionHandling::Descend) => {
                        Ok(crate::input::options::NestedSessionHandling::Descend)
                    },
                    Some(ProtoNestedSessionHandling::Never) => {
                        Ok(crate::input::options::NestedSessionHandling::Never)
                    },
                    _ => Err(anyhow!("Invalid NestedSessionHandling value: {}", n)),
                })
                .transpose()?,
            explicit_theme_hue: options
                .explicit_theme_hue
                .map(|hue| {
                    use crate::client_server_contract::client_server_contract::ThemeHue as ProtoThemeHue;
                    match ProtoThemeHue::try_from(hue).ok() {
                        Some(ProtoThemeHue::Dark) => Ok(crate::data::ThemeHue::Dark),
                        Some(ProtoThemeHue::Light) => Ok(crate::data::ThemeHue::Light),
                        _ => Err(anyhow!("Invalid ThemeHue value: {}", hue)),
                    }
                })
                .transpose()?,
        })
    }
}

// Complete Action conversion implementation - all 91 variants

View on GitHub (pinned to e839bfffa5)