diff --git a/src/lib/model-options.ts b/src/lib/model-options.ts
index b3f235b80..a0d0b5b1f 100644
--- a/src/lib/model-options.ts
+++ b/src/lib/model-options.ts
@@ -99,7 +99,7 @@ export function buildRuntimeProviderOptions(
     .sort((left, right) => {
       if (left.id === providerDefaultAccountId) return -1;
       if (right.id === providerDefaultAccountId) return 1;
-      return right.updatedAt.localeCompare(left.updatedAt);
+      return (right.updatedAt ?? '').localeCompare(left.updatedAt ?? '');
     });
 
   const deduped = new Map<string, RuntimeProviderOption>();
@@ -142,7 +142,7 @@ export function buildConfiguredModelOptions(
     .sort((left, right) => {
       if (left.id === providerDefaultAccountId) return -1;
       if (right.id === providerDefaultAccountId) return 1;
-      return right.updatedAt.localeCompare(left.updatedAt);
+      return (right.updatedAt ?? '').localeCompare(left.updatedAt ?? '');
     });
 
   const deduped = new Map<string, ConfiguredModelOption>();
diff --git a/src/lib/provider-accounts.ts b/src/lib/provider-accounts.ts
index 3b6348e6b..57c1ba469 100644
--- a/src/lib/provider-accounts.ts
+++ b/src/lib/provider-accounts.ts
@@ -189,7 +189,7 @@ export function buildProviderListItems(
       .sort((left, right) => {
         if (left.account.id === defaultAccountId) return -1;
         if (right.account.id === defaultAccountId) return 1;
-        return right.account.updatedAt.localeCompare(left.account.updatedAt);
+        return (right.account.updatedAt ?? '').localeCompare(left.account.updatedAt ?? '');
       });
   }