diff --git a/src/Managing.Api/Controllers/DataController.cs b/src/Managing.Api/Controllers/DataController.cs
index 4e4b6dde..c9e79146 100644
--- a/src/Managing.Api/Controllers/DataController.cs
+++ b/src/Managing.Api/Controllers/DataController.cs
@@ -47,6 +47,7 @@ public class DataController : ControllerBase
     /// <param name="accountService">Service for account management.</param>
     /// <param name="cacheService">Service for caching data.</param>
     /// <param name="statisticService">Service for statistical analysis.</param>
+    /// <param name="agentService">Service for agents</param>
     /// <param name="hubContext">SignalR hub context for real-time communication.</param>
     /// <param name="mediator">Mediator for handling commands and queries.</param>
     /// <param name="tradingService">Service for trading operations.</param>
@@ -451,6 +452,11 @@ public class DataController : ControllerBase
     [HttpGet("GetUserStrategies")]
     public async Task<ActionResult<List<UserStrategyDetailsViewModel>>> GetUserStrategies(string agentName)
     {
+        if (string.IsNullOrEmpty(agentName))
+        {
+            return BadRequest("Agent name cannot be null or empty.");
+        }
+
         // Get all strategies for the specified user
         var userStrategies = await _mediator.Send(new GetUserStrategiesCommand(agentName));
 
@@ -476,6 +482,16 @@ public class DataController : ControllerBase
     [HttpGet("GetUserStrategy")]
     public async Task<ActionResult<UserStrategyDetailsViewModel>> GetUserStrategy(string agentName, string strategyName)
     {
+        if (string.IsNullOrEmpty(agentName))
+        {
+            return BadRequest("Agent name cannot be null or empty.");
+        }
+
+        if (string.IsNullOrEmpty(strategyName))
+        {
+            return BadRequest("Strategy name cannot be null or empty.");
+        }
+
         // Get the specific strategy for the user
         var strategy = await _mediator.Send(new GetUserStrategyCommand(agentName, strategyName));
 
diff --git a/src/Managing.Application/Users/UserService.cs b/src/Managing.Application/Users/UserService.cs
index fcc23557..6d838b9b 100644
--- a/src/Managing.Application/Users/UserService.cs
+++ b/src/Managing.Application/Users/UserService.cs
@@ -56,14 +56,12 @@ public class UserService : IUserService
 
         if (!_authorizedAddresses.Any(a => string.Equals(a, recoveredAddress, StringComparison.OrdinalIgnoreCase)))
         {
-            _logger.LogWarning($"Address {recoveredAddress} not authorized");
-            throw new Exception("Address not authorized");
+            throw new Exception($"Address {recoveredAddress}  not authorized");
         }
 
         if (recoveredAddress == null || !recoveredAddress.Equals(address))
         {
-            _logger.LogWarning($"Address {recoveredAddress} not corresponding");
-            throw new Exception("Address not corresponding");
+            throw new Exception($"Address {recoveredAddress} not corresponding");
         }
 
         // Check if account exist
@@ -72,7 +70,7 @@ public class UserService : IUserService
         if (user != null)
         {
             if (!user.Name.Equals(name))
-                throw new Exception("Name not corresponding");
+                throw new Exception("Name not corresponding to user " + name);
 
             // User and account found
             user.Accounts = _accountService.GetAccountsByUser(user).ToList();
@@ -82,7 +80,7 @@ public class UserService : IUserService
 
             if (account == null)
             {
-                throw new Exception("Account not found");
+                throw new Exception("Account not found for address " + recoveredAddress);
             }
 
             return user;