diff --git a/misc-scripts/xref_mapping/XrefMapper/BasicMapper.pm b/misc-scripts/xref_mapping/XrefMapper/BasicMapper.pm
index b98e0935fd55ae5d5bb612513717424c5af63793..202fbc901bd9cb469f83a71b62487d81919c701d 100644
--- a/misc-scripts/xref_mapping/XrefMapper/BasicMapper.pm
+++ b/misc-scripts/xref_mapping/XrefMapper/BasicMapper.pm
@@ -2179,7 +2179,7 @@ sub dump_interpro {
                      $dx_accession,
                      $dx_label,
                      $dx_version,
-                     $dx_description,
+                     $dx_description || "",
                      'DEPENDENT',
                      "Generated via $interpro");
         $xref_count++;