LogicException: The database connection is not serializable.

The patch from #4 when applied to 5.0-beta16 doesn't work.

Thanks, will try tomorrow.
The patch appeared to apply cleanly though.

@jrockowitz do you know a method to quickly see where the database connection is coming from. I know it's somewhere in the render array but it's impossible the see where it is coming from.

@jrockowitz I just updated to 5.x-dev and this error is still happening.
It only happens on webforms with multiple pages though.

I managed to fix it!
I have a custom element and did:

$element['#element_validate'][] = [$this, 'validateSignature'];

Now changed it to:

$element['#element_validate'][] = [get_class($this), 'validateSignature'];

And made the validate function static.

No idea why it worked before. My element just extends the Radios element so it should manage the serialization just fine.

I used the following code snipped in PhpSerialize:

  public static function serializeDebug($data, $path) {
    if (is_array($data)) {
      foreach ($data as $key => $value) {
        self::serializeDebug($value, $path . ' => ' . $key);
      }
    }
    try {
      serialize($data);
    } catch (\Exception $e) {
      if ($e) {

      }
    }
  }

I breakpointed the if ($e) {, so I would have the exact path that causes the error.

I added the following function to the encode($data) function in PhpSerialize before the actual serialize:

self::serializeDebug($data, '');