diff --git a/src/js/main.js b/src/js/main.js
index 88086dee..3e5dfdb6 100644
--- a/src/js/main.js
+++ b/src/js/main.js
@@ -173,7 +173,7 @@ function startProcess() {
 
             GUI.tab_switch_cleanup(function () {
                 // disable active firmware flasher if it was active
-                if ($('div#flashbutton a.flash_state').hasClass('active') && $('div#flashbutton a.flash').addClass('active')) {
+                if ($('div#flashbutton a.flash_state').hasClass('active') && $('div#flashbutton a.flash').hasClass('active')) {
                     $('div#flashbutton a.flash_state').removeClass('active');
                     $('div#flashbutton a.flash').removeClass('active');
                 }