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Not sure how your implementation looks like, but if you replace it with something like this it should do what you need it to do:

function StartWorkflowJsLink (ctx) {
 var _value = ctx.CurrentItem[ctx.CurrentFieldSchema.Name];

     if (_value == 'Start')
     {
        return "HERE GOES YOUR CURRENT IMPLEMENTATION IN CASE OF VALUE 'Start'";
     }
     return _value;
}