If any of Extensions.GenericEntities, MIMETypes, or Verbs are set, all must be set

[fredemmott]

Otherwise wixsharp crashes, e.g.:

Unhandled exception: System.ArgumentNullException: Value cannot be null. (Parameter 'source')
   at System.Linq.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at WixSharp.Extensions.ForEach[T](IEnumerable`1 collection, Action`1 action)
   at WixSharp.Extension.Process(ProcessingContext context)
   at WixSharp.ProgId.<>c__DisplayClass11_0.<Process>b__0(Extension ext)
   at WixSharp.Extensions.ForEach[T](IEnumerable`1 collection, Action`1 action)
   at WixSharp.ProgId.Process(ProcessingContext context)
   at WixSharp.ProgId.<>c__DisplayClass11_0.<Process>b__1(ProgId progId)
   at WixSharp.Extensions.ForEach[T](IEnumerable`1 collection, Action`1 action)
   at WixSharp.ProgId.Process(ProcessingContext context)

[oleg-shilo]

Indeed it is a defect.
Corrected.
Will be available in the very next release.

In the meantime please initialize the see three collections explicitly as you probably do already.

[oleg-shilo]

Done. Please update to v2.4.4