diff --git a/ReportImp/PerspektivenEV/Export/DatevExporterBthg.cs b/ReportImp/PerspektivenEV/Export/DatevExporterBthg.cs
index 0e70205d4..6c378ab0a 100644
--- a/ReportImp/PerspektivenEV/Export/DatevExporterBthg.cs
+++ b/ReportImp/PerspektivenEV/Export/DatevExporterBthg.cs
@@ -210,7 +210,7 @@ namespace PerspektivenEV.Export
                 if (row[12] != null)
                     isApproved = row[12].ToString();
 
-                if (row[16] != null)
+                if (row[16] != null && row[16] != DBNull.Value)
                     cOid = long.Parse(row[16].ToString());
 
                 if (sb.Length > 0)