Exception "Array to string conversion" in form checkboxes

Using Neos & Flow Frontend & Integration
3

Hello Sebastian, to be honest, I’m not really aware of what I’m doing. The error seems to occur in a part of the standard way but seems to be caused by the own checkbox implementation. Due to lack of knowledge I’m not able to track the way through the NEOS form implementation. Maybe it happens within the finisher where I use the standard implementation of the Demo package:

Hello,

<f:for each="{form.formState.formValues}" as="value" key="label">
	{label}: {value}
</f:for>

Thanks

But as I told I just don’t know how to track further down. Do you have some hints for me?