DioxusLabs/dioxus · error

Tried to access `ok` on an Err value

Error message

Tried to access `ok` on an Err value

What it means

`Store<Result<T,E>>::ok()` returns None when the store currently holds an Err value. The message surfaces if a store that must be Ok at this point is Err — i.e. the tracked Result state changed to (or was created as) Err while calling code assumed success. The docstring documents this shallow-tracking semantics; the panic text is the diagnostic shown when code unwraps through the Err branch.

Source

Thrown at packages/stores/src/impls/result.rs:96

    }

    /// Converts `Store<Result<T, E>>` into `Option<Store<T>>`, discarding the error if present. This will
    /// only track the shallow state of the `Result`. It will only cause a re-run if the `Result` could
    /// change from `Err` to `Ok` or vice versa.
    ///
    /// # Example
    /// ```rust, no_run
    /// use dioxus_stores::*;
    /// let store = use_store(|| Ok::<u32, ()>(42));
    /// match store.ok() {
    ///     Some(ok_store) => assert_eq!(ok_store(), 42),
    ///     None => panic!("Expected Ok"),
    /// }
    /// ```
    pub fn ok(self) -> Option<MappedStore<T, Lens>> {
        let map: fn(&Result<T, E>) -> &T = |value| {
            value.as_ref().unwrap_or_else(|_| {
                panic!("Tried to access `ok` on an Err value");
            })
        };
        let map_mut: fn(&mut Result<T, E>) -> &mut T = |value| {
            value.as_mut().unwrap_or_else(|_| {
                panic!("Tried to access `ok` on an Err value");
            })
        };
        self.is_ok()
            .then(|| self.into_selector().child(0, map, map_mut).into())
    }

    /// Converts `Store<Result<T, E>>` into `Option<Store<E>>`, discarding the success if present. This will
    /// only track the shallow state of the `Result`. It will only cause a re-run if the `Result` could
    /// change from `Ok` to `Err` or vice versa.
    ///
    /// # Example
    /// ```rust, no_run
    /// use dioxus_stores::*;

View on GitHub (pinned to 24f6a829df)

Solutions

1. The Result value is Err. Match on the Result before accessing the ok payload.

When it happens

Trigger: Thrown at packages/stores/src/impls/result.rs:96 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of DioxusLabs/dioxus@24f6a829df (2026-08-23). Data as JSON: /api/errors/47822e0fdc67deb9. Report an issue: GitHub.