Hi,

It seems there is a problem with form serialization in 3.2.

Exception in FormDataCollector.php line 274: Serialization of 'Closure' is not allowed

Disabling the profiler or downgrading to "symfony/form": "3.1.*" "fixes" the problem.

https://gist.github.com/Padam87/dfbfd4a63064b0ac45068ad06bcc4876