[Bug 5596] New: Runtime error '13' in VB App at concat Null to NullString

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=5596

Summary: Runtime error '13' in VB App at concat Null to
                    NullString
           Product: Wine
           Version: 0.9.16.
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-binary
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

In VB6 is typic concat a Recordset Field value to nullstring ("") so:
MyStringVar = "" & MyRecordset.Field("FieldName").Value
In this case, if the field value is Null, it come convert in a string, but 
Wine raise the error: Type Mismatch (Err N.13). In Windows work normally!