diff --git a/application/module/Westdc/Dataimport/AbstractProcessing.php b/application/module/Westdc/Dataimport/AbstractProcessing.php
index 707778f1..43763503 100644
--- a/application/module/Westdc/Dataimport/AbstractProcessing.php
+++ b/application/module/Westdc/Dataimport/AbstractProcessing.php
@@ -24,13 +24,13 @@ abstract class AbstractProcessing {
             case "bigint":
             case "real":
             case "double precision":
-                return is_int($data) || is_float($data);
+                return is_int($data) || is_float($data) || is_null($data);
             case "date":
             case "timestamp without time zone":
             case "char":
             case "character varying":
             case "text":
-                return is_string($data);
+                return is_string($data) || is_null($data);
 
             default:
                 return FALSE;