diff --git a/module/settings/startingSidebarTab.mjs b/module/settings/startingSidebarTab.mjs
index 94c6496..cc29f70 100644
--- a/module/settings/startingSidebarTab.mjs
+++ b/module/settings/startingSidebarTab.mjs
@@ -42,6 +42,10 @@ export function startingSidebarTab() {
 	// #region Implementation
 	Hooks.once(`ready`, () => {
 		const defaultTab = game.settings.get(__ID__, key);
+		if (!(defaultTab in CONFIG.ui.sidebar.TABS)) {
+			Logger.error(`Failed to find starting tab with ID "${defaultTab}", skipping`);
+			return;
+		};
 		if (defaultTab) {
 			Logger.debug(`Changing tab to:`, defaultTab);
 			ui.sidebar.changeTab(defaultTab, `primary`);