DioxusLabs/dioxus · error

Failed to initialize lazy value

Error message

Failed to initialize lazy value

What it means

`Lazy::get` blocks until initialization completes and `expect`s the value to then be present. This panic fires when the lazy value was never initialized despite the constructor being cleared — i.e. `initialize` was not called (or its set step failed) before dereferencing, as the panic text itself explains.

Source

Thrown at packages/fullstack/src/lazy.rs:102

                self.value.wait();
                return Ok(());
            }

            // Otherwise, we need to initialize the value
            self.set(constructor().unwrap())?;
        }
        Ok(())
    }

    /// Get a reference to the value of the `Lazy` instance. This will block the current thread if the
    /// value is not yet initialized.
    pub fn get(&self) -> &T {
        if self.constructor.is_none() {
            return self.value.get().expect("Lazy value is not initialized. Make sure to call `initialize` before dereferencing.");
        };

        if self.value.get().is_none() {
            self.initialize().expect("Failed to initialize lazy value");
        }

        self.value.get().unwrap()
    }
}

impl<T: Send + Sync + 'static> Default for Lazy<T> {
    fn default() -> Self {
        Self::lazy()
    }
}

impl<T: Send + Sync + 'static> std::ops::Deref for Lazy<T> {
    type Target = T;

    fn deref(&self) -> &Self::Target {
        self.get()
    }

View on GitHub (pinned to 24f6a829df)

Solutions

1. Inspect the initialization error of the lazy value (e.g. failed fetch or deserialization) and fix the underlying cause before dereferencing it.

When it happens

Trigger: Thrown at packages/fullstack/src/lazy.rs:102 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/20949fbbc1014bb9. Report an issue: GitHub.