diff --git a/server/modules/surveyRdb/manager/surveyRdbCsvExport.js b/server/modules/surveyRdb/manager/surveyRdbCsvExport.js
index 26d3a05225..35686da959 100644
--- a/server/modules/surveyRdb/manager/surveyRdbCsvExport.js
+++ b/server/modules/surveyRdb/manager/surveyRdbCsvExport.js
@@ -192,7 +192,7 @@ const getCsvObjectTransformer = ({
     transformers.push(getCsvObjectTransformerExpandCategoryItems({ survey, query }))
   }
   if (nullsToEmpty) {
-    transformers.push(getCsvObjectTransformerNullsToEmpty)
+    transformers.push(getCsvObjectTransformerNullsToEmpty())
   }
   if (keepFileNamesUnique) {
     const { transformer } = getCsvObjectTransformerUniqueFileNames({