We got problems with forms using select-lists with customized options, when they are optional and broke it down to this method while debugging.
When the input is optional and not selected, both ($options[$value] and $value) where empty (NULL) in our cases.
Since the method-signature requires the method to return a string, this fails with Return value of Neos\Form\ViewHelpers\RenderValuesViewHelper_Original::mapValueToOption() must be of the type string, null returned.
Probably this was introduced with the strict-types declaration
I solved it by simply adding an empty string as fallback-value here and think that should also get into the Neos.Form-Core.
We got problems with forms using select-lists with customized options, when they are optional and broke it down to this method while debugging.
When the input is optional and not selected, both (
$options[$value]and$value) where empty (NULL) in our cases.Since the method-signature requires the method to return a string, this fails with
Return value of Neos\Form\ViewHelpers\RenderValuesViewHelper_Original::mapValueToOption() must be of the type string, null returned.Probably this was introduced with the strict-types declaration
I solved it by simply adding an empty string as fallback-value here and think that should also get into the Neos.Form-Core.