diff --git a/im.js b/im.js
index 86afca0..fcc692f 100644
--- a/im.js
+++ b/im.js
@@ -250,7 +250,7 @@ function registerResendDelay(task) {
         return;
     }
 
-    if (!config || !config.globals || !config.globals.auto_resend_delay_secs) {
+    if (!config || !config.globals || !Number(config.globals.auto_resend_delay_secs) {
         return;
     }