Method Symfony\Component\HttpFoundation\Cookie::__toString() must not throw an exception, caught ErrorException: Array to string conversion

[SebastiaanKloos]

Your plugin breaks the RainLab.User plugin. See GIF attached.

Symfony\Component\Debug\Exception\FatalErrorException: Method Symfony\Component\HttpFoundation\Cookie::__toString() must not throw an exception, caught ErrorException: Array to string conversion

[frthjf]

Hi Sebastiaan,

I'm sorry you are experiencing this issue. I'll try and reproduce the problem now and keep you posted.

[frthjf]

Turns out the problem is not a direct problem with Headstart but a consequence of the dependencies of the Lighthouse server. It triggers an upgrade of the Symphony framework, which in turn leads to this known breaking change.

The source of the error then is line 617 in vendor/october/rain/src/Auth/Manager.php:

Cookie::queue(Cookie::forever($this->sessionKey, $toPersist));

where $toPersist is an array and the implicit string conversion fails.

I'm afraid this can only be resolved through the planned move to Laravel 6 which will bump the Symphony dependency.

As a workaround, you have two options:

• disable 'remember me' or comment out the line 617 that produces the error
• downgrade to Headstart 1.0.1 that does not upgrade the dependency

I hope this helps.