diff --git a/public/plugins/vue/tt-components/tt-button.js b/public/plugins/vue/tt-components/tt-button.js
index f5e28f50c..65e7f0f2a 100644
--- a/public/plugins/vue/tt-components/tt-button.js
+++ b/public/plugins/vue/tt-components/tt-button.js
@@ -30,6 +30,8 @@ Vue.component('tt-button', {
                 'btn-sm': this.sm,
             }
 
+            if (!this.additionalClass) return classes
+
             for (const className of this.additionalClass.split(' ')) {
                 classes[className] = true
             }