FindDuplicates with Generics: System.InvalidCastException : Conversion from type 'DBNull' to type 'Integer' is not valid.

[jochenwezel]

at Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(Object Value)
Conversions.ToGenericParameter[T](Object Value)
DataTablesTools.FindDuplicates[T](DataColumn column, Int32 minOccurances) Zeile 183
DataTablesTools.FindDuplicates[T](DataColumn column) Zeile 167
DataTables.FindDuplicates[T](DataColumn column) Zeile 396
DataTablesTest.FindDuplicates() Zeile 2632
RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)