diff --git a/xmlout.js b/xmlout.js
index 5a4ba60..2fd3faa 100644
--- a/xmlout.js
+++ b/xmlout.js
@@ -341,7 +341,7 @@ function getTaskKey(task, chipInfo) {
 
 
 function putTaskToHistory(task, cb) {
-    if (config.globals.no_dupe_check) {
+    if (Number(config.globals.no_dupe_check)) {
         if (cb) { cb(); }
         return;
     }