fixed issue when tab data can't be found

extension/core/bg/autosave.js

@@ -63,7 +63,7 @@ singlefile.autosave = (() => {
 
 	async function isEnabled(tab) {
 		const [tabsData, rule] = await Promise.all([singlefile.tabsData.get(), singlefile.config.getRule(tab.url)]);
-		return singlefile.util.isAllowedURL(tab.url) && Boolean(tabsData.autoSaveAll || (tabsData.autoSaveUnpinned && !tab.pinned) || tabsData[tab.id].autoSave) && (!rule || rule.autoSaveProfile != singlefile.config.DISABLED_PROFILE_NAME);
+		return singlefile.util.isAllowedURL(tab.url) && Boolean(tabsData.autoSaveAll || (tabsData.autoSaveUnpinned && !tab.pinned) || (tabsData[tab.id] && tabsData[tab.id].autoSave)) && (!rule || rule.autoSaveProfile != singlefile.config.DISABLED_PROFILE_NAME);
 	}
 
 	async function refreshTabs() {