diff --git a/src/tab-container-element.ts b/src/tab-container-element.ts
index ea335b7..054c8e0 100644
--- a/src/tab-container-element.ts
+++ b/src/tab-container-element.ts
@@ -373,6 +373,9 @@ export class TabContainerElement extends HTMLElement {
const selectedTab = tabs[index]
const selectedPanel = panels[index]
+ if (!selectedTab) return
+ if (!selectedPanel) return
+
if (this.#setupComplete) {
const cancelled = !this.dispatchEvent(
new TabContainerChangeEvent('tab-container-change', {
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