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Created attachment 24774 [details]
In a ListView ItemTemplate, if you use the dot syntax for a data binding with a data converter, the list item is not always the bound object when Convert is called. Sometimes Convert is called with a value of null, and sometimes it is called with a value of the entire list.
In the repro, the code in Convert expects value of be of type ListItem, which causes it to crash when the cast fails. The iOS and Android projects are not used or included for this repro. I haven't tried them.