Building the SettleTask settings form outside a request (the modeler rendering it) passes a form state whose getUserInput() is null. The payable-resolver picker in PayableResolverConfigTrait read that raw input to keep a live AJAX selection, which fatally failed: NestedArray::getValue() requires an array and takes it by reference. This defaults the input to an array held in a local variable.
Regression test added: the settle task's config form builds with no user input. Introduced in issue 3610001.
Issue fork orchestra-3610015
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Comment #4
mably commented