lib/lookbook/param.rb in lookbook-2.0.5 vs lib/lookbook/param.rb in lookbook-2.1.0

@@ -26,10 +26,10 @@
 
     def value
       val = @value || value_default
       if value_type == "datetime"
         formatter = (input == "datetime-local") ? "%Y-%m-%dT%T" : "%Y-%m-%d"
-        StringValueCaster.call(val, "datetime").strftime(formatter)
+        StringValueCaster.call(val, "datetime")&.strftime(formatter)
       else
         val
       end
     end