diff --git a/src/Services/LdapService.cs b/src/Services/LdapService.cs
index 736ef8e..47b2506 100644
--- a/src/Services/LdapService.cs
+++ b/src/Services/LdapService.cs
@@ -144,16 +144,23 @@ public partial class LdapService : IDisposable
         await ConnectAndBind();
         try
         {
-            UserModel user = await GetUserByUidAsync(username);
-            if (user.UserPassword is null)
+            try
+            {
+                UserModel user = await GetUserByUidAsync(username);
+                if (user.UserPassword is null)
+                {
+                    return new() { Success = false, AuthenticationState = UserNotAuthenticatedReason.InvalidCredentials };
+                }
+                if (CompareStringToSha256(password, user.UserPassword))
+                {
+                    return new() { Success = true };
+                }
+                return new() { Success = false, AuthenticationState = UserNotAuthenticatedReason.InvalidCredentials };
+            }
+            catch (InvalidOperationException)
             {
                 return new() { Success = false, AuthenticationState = UserNotAuthenticatedReason.InvalidCredentials };
             }
-            if (CompareStringToSha256(password, user.UserPassword))
-            {
-                return new() { Success = true};
-            }
-            return new() { Success = false, AuthenticationState = UserNotAuthenticatedReason.InvalidCredentials };
         }
         catch (LdapException)
         {