diff --git a/tbl_replace.php b/tbl_replace.php
index 6d4fd83da..e372bd0ab 100644
--- a/tbl_replace.php
+++ b/tbl_replace.php
@@ -230,7 +230,7 @@ foreach ($loop_array as $rowcount => $where_clause) {
             if (isset($remove_blob_repo) && ! isset($upload_blob_repo)) {
                 $remove_blob_reference = $_REQUEST['remove_blob_ref_' . $key];
                 if (isset($remove_blob_reference)) {
-                    $val = "''";
+                    $val = "NULL";
                 }
             }