diff --git a/web/src/routes/settings/+page.svelte b/web/src/routes/settings/+page.svelte
index c825699..07f307a 100644
--- a/web/src/routes/settings/+page.svelte
+++ b/web/src/routes/settings/+page.svelte
@@ -105,25 +105,25 @@
 			revision_retention_minutes: ''
 		};
 
-		const routerId = knownFields.bird_router_id.trim();
+		const routerId = String(knownFields.bird_router_id ?? '').trim();
 		if (routerId && !isValidIPv4(routerId)) errors.bird_router_id = 'Введите корректный IPv4 адрес';
 
-		const localV4 = knownFields.bird_local_ipv4.trim();
+		const localV4 = String(knownFields.bird_local_ipv4 ?? '').trim();
 		if (localV4 && !isValidIPv4(localV4)) errors.bird_local_ipv4 = 'Введите корректный IPv4 адрес';
 
-		const localV6 = knownFields.bird_local_ipv6.trim();
+		const localV6 = String(knownFields.bird_local_ipv6 ?? '').trim();
 		if (localV6 && !isValidIPv6(localV6)) errors.bird_local_ipv6 = 'Введите корректный IPv6 адрес';
 
-		const asn = knownFields.bird_local_asn.trim();
+		const asn = String(knownFields.bird_local_asn ?? '').trim();
 		if (asn && !isPositiveInt(asn)) errors.bird_local_asn = 'ASN должен быть целым числом больше 0';
 
-		const bgpV4 = knownFields.bird_bgp_source_ipv4.trim();
+		const bgpV4 = String(knownFields.bird_bgp_source_ipv4 ?? '').trim();
 		if (bgpV4 && !isValidIPv4(bgpV4)) errors.bird_bgp_source_ipv4 = 'Введите корректный IPv4 адрес';
 
-		const bgpV6 = knownFields.bird_bgp_source_ipv6.trim();
+		const bgpV6 = String(knownFields.bird_bgp_source_ipv6 ?? '').trim();
 		if (bgpV6 && !isValidIPv6(bgpV6)) errors.bird_bgp_source_ipv6 = 'Введите корректный IPv6 адрес';
 
-		const revisionRetentionMinutes = knownFields.revision_retention_minutes.trim();
+		const revisionRetentionMinutes = String(knownFields.revision_retention_minutes ?? '').trim();
 		if (revisionRetentionMinutes) {
 			const ttl = Number(revisionRetentionMinutes);
 			if (
@@ -210,7 +210,7 @@
 		if (loadingSettings || savingSettings || hasValidationErrors) return false;
 
 		const hasKnownValues = knownFieldKeys.some((key) => {
-			const value = knownFields[key].trim();
+			const value = String(knownFields[key] ?? '').trim();
 			return value !== '' && !knownFieldErrors[key];
 		});
 		const hasAdditionalValues = additionalSettings.some((entry) => entry.key.trim() !== '');
@@ -219,11 +219,14 @@
 	});
 
 	async function saveApiSettings() {
-		if (!canSaveSettings) return;
+		if (!canSaveSettings) {
+			toast.error('Нечего сохранять или есть ошибки в полях');
+			return;
+		}
 
 		const payload: Record<string, string | number> = {};
 		for (const key of knownFieldKeys) {
-			const value = knownFields[key].trim();
+			const value = String(knownFields[key] ?? '').trim();
 			if (!value || knownFieldErrors[key]) continue;
 			if (key === 'bird_local_asn' || key === 'revision_retention_minutes') payload[key] = Number(value);
 			else payload[key] = value;