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Nullable type - Value Exception

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Compilation time: 0,14 sec, absolute running time: 0,11 sec, cpu time: 0,11 sec, average memory usage: 18 Mb, average nr of threads: 3, absolute service time: 0,27 sec 
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Error(s):
Exception in user code:

System.InvalidOperationException: Nullable object must have a value.
   at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
   at Rextester.Program.Main(String[] args)