diff --git a/backend/Tnsu.ApprovalRoute.Api/Controllers/RequestManageController.cs b/backend/Tnsu.ApprovalRoute.Api/Controllers/RequestManageController.cs
index fdb4fc6..680f348 100644
--- a/backend/Tnsu.ApprovalRoute.Api/Controllers/RequestManageController.cs
+++ b/backend/Tnsu.ApprovalRoute.Api/Controllers/RequestManageController.cs
@@ -23,7 +23,12 @@ public sealed class RequestManageController(RequestManageService service) : Cont
     [ProducesResponseType(typeof(ApiError), StatusCodes.Status404NotFound)]
     public async Task<IActionResult> Search(
         [FromQuery] int requestTypeId,
-        [FromQuery] string query,
+        // string? (не string) — [ApiController] с Nullable enable иначе считает
+        // query обязательным параметром модели, а IHttpClient.buildUrl (см.
+        // httpClient.ts) вырезает из URL пустые query-параметры целиком: пустое
+        // поле поиска (обычное состояние при открытии комбобокса) присылало
+        // запрос вовсе БЕЗ query, и такой запрос падал 400 ещё до контроллера.
+        [FromQuery] string? query,
         [FromQuery] int page,
         [FromQuery] int? pageSize,
         CancellationToken ct) =>
@@ -45,7 +50,7 @@ public sealed class RequestManageController(RequestManageService service) : Cont
     [HttpGet("by-approver")]
     [ProducesResponseType(typeof(ApiResponse<IReadOnlyList<UserApprovalRowDto>>), StatusCodes.Status200OK)]
     public async Task<IActionResult> ByApprover(
-        [FromQuery] string approverEmail, [FromQuery] string statuses, CancellationToken ct)
+        [FromQuery] string approverEmail, [FromQuery] string? statuses, CancellationToken ct)
     {
         var activeStatuses = (statuses ?? string.Empty)
             .Split(',', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries)