diff --git a/system/src/Grav/Framework/File/Formatter/CsvFormatter.php b/system/src/Grav/Framework/File/Formatter/CsvFormatter.php
index d42249696..2b159f686 100644
--- a/system/src/Grav/Framework/File/Formatter/CsvFormatter.php
+++ b/system/src/Grav/Framework/File/Formatter/CsvFormatter.php
@@ -97,7 +97,7 @@ class CsvFormatter extends AbstractFormatter
 
                     if ($null_replace) {
                         array_walk($csv_line, static function (&$el) use ($null_replace) {
-                            $el = str_replace($null_replace, null, $el);
+                            $el = str_replace($null_replace, "\0", $el);
                         });
                     }