livewire/livewire · error · Exception

Unable to evaluate dynamic session key placeholder: ${matche

Error message

Unable to evaluate dynamic session key placeholder: ${matches[0]}

What it means

Error "Unable to evaluate dynamic session key placeholder: ${matches[0]}" thrown in livewire/livewire.

Source

Thrown at src/Features/SupportSession/BaseSession.php:58

    protected function write()
    {
        Session::put($this->key(), $this->getValue());
    }

    protected function key()
    {
        if (! $this->key) {
            return (string) 'lw' . crc32($this->component->getName() . $this->getName());
        }

        return self::replaceDynamicPlaceholders($this->key, $this->component);
    }

    static function replaceDynamicPlaceholders($key, $component)
    {
        return preg_replace_callback('/\{(.*)\}/U', function ($matches) use ($component) {
            return data_get($component, $matches[1], function () use ($matches) {
                throw new \Exception('Unable to evaluate dynamic session key placeholder: '.$matches[0]);
            });
        }, $key);
    }
}

View on GitHub (pinned to 1a3fde34c5)

When it happens

Trigger: Thrown at src/Features/SupportSession/BaseSession.php:58 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of livewire/livewire@1a3fde34c5 (2026-08-17). Data as JSON: /api/errors/006d399eee5a1fb4. Report an issue: GitHub.