diff --git a/src/components/tab_switcher/tab_switcher.jsx b/src/components/tab_switcher/tab_switcher.jsx
index f5a1e603..c8d390bc 100644
--- a/src/components/tab_switcher/tab_switcher.jsx
+++ b/src/components/tab_switcher/tab_switcher.jsx
@@ -50,7 +50,7 @@ export default {
     activeIndex () {
       // In case of controlled component
       if (this.activeTab) {
-        return this.slots().findIndex(slot => this.activeTab === slot.props.key)
+        return this.slots().findIndex(slot => slot && slot.props && this.activeTab === slot.props.key)
       } else {
         return this.active
       }