diff --git a/src/Dynamicweb.Ecommerce.CheckoutHandlers.QuickPayPaymentWindow.csproj b/src/Dynamicweb.Ecommerce.CheckoutHandlers.QuickPayPaymentWindow.csproj
index 0475c30..6b99a74 100644
--- a/src/Dynamicweb.Ecommerce.CheckoutHandlers.QuickPayPaymentWindow.csproj
+++ b/src/Dynamicweb.Ecommerce.CheckoutHandlers.QuickPayPaymentWindow.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 	<PropertyGroup>
-		<VersionPrefix>10.1.3</VersionPrefix>
+		<VersionPrefix>10.1.4</VersionPrefix>
 		<AssemblyVersion>1.0.0.0</AssemblyVersion>
 		<Title>QuickPay Payment Window</Title>
 		<Description>The QuickPay Payment Window checkout handler is designed to work with QuickPay v10.</Description>
diff --git a/src/QuickPayPaymentWindow.cs b/src/QuickPayPaymentWindow.cs
index 96e972a..3ab4a9d 100644
--- a/src/QuickPayPaymentWindow.cs
+++ b/src/QuickPayPaymentWindow.cs
@@ -1084,8 +1084,8 @@ private CheckedData CheckData(Order order, string responseText, long transaction
         LogEvent(order, "Response validation started");
 
         var quickpayResponse = Converter.Deserialize<Dictionary<string, object>>(responseText);
-        var operations = Converter.Deserialize<Dictionary<string, object>[]>(Converter.ToString(quickpayResponse["operations"]));
-        var metadata = Converter.Deserialize<Dictionary<string, object>>(Converter.ToString(quickpayResponse["metadata"]));
+        var operations = Converter.Deserialize<Dictionary<string, object>[]>(Converter.Serialize(quickpayResponse["operations"]));
+        var metadata = Converter.Deserialize<Dictionary<string, object>>(Converter.Serialize(quickpayResponse["metadata"]));
 
         string errorMessage = "Some unhandled error is occured.";
 
@@ -1127,7 +1127,7 @@ private CheckedData CheckData(Order order, string responseText, long transaction
             string fraudSuspectedKey = "fraud_suspected";
             if (metadata.ContainsKey(fraudSuspectedKey) && Converter.ToBoolean(metadata[fraudSuspectedKey]) is true)
             {
-                string[] fraudRemarks = Converter.Deserialize<string[]>(Converter.ToString(metadata["fraud_remarks"]));
+                string[] fraudRemarks = Converter.Deserialize<string[]>(Converter.Serialize(metadata["fraud_remarks"]));
                 string fraudText = string.Join(System.Environment.NewLine, fraudRemarks);
                 errorMessage = $"{errorMessage}. {fraudText}";
             }
@@ -1371,7 +1371,7 @@ private OperationStatus GetLastOperationStatus(Order order, string operationType
             {
                 paymentModel = Converter.Deserialize<Dictionary<string, object>>(responseText);
             }
-            var operations = Converter.Deserialize<Dictionary<string, object>[]>(Converter.ToString(paymentModel["operations"]));
+            var operations = Converter.Deserialize<Dictionary<string, object>[]>(Converter.Serialize(paymentModel["operations"]));
 
             Dictionary<string, object> operation;
             operation = operations.Last(o => string.IsNullOrEmpty(operationTypeLock) ||
diff --git a/src/QuickPayRequest.cs b/src/QuickPayRequest.cs
index 7905376..de42537 100644
--- a/src/QuickPayRequest.cs
+++ b/src/QuickPayRequest.cs
@@ -82,14 +82,19 @@ ApiService.DeleteCard or
 
                         if (!response.IsSuccessStatusCode)
                         {
-                            var error = Converter.Deserialize<ServiceError>(responseText);
-                            if (error.ErrorCode > 0 || !string.IsNullOrWhiteSpace(error.Message))
+                            string errorMessage = $"QuickPay request failed with HTTP status {(int)response.StatusCode} {response.ReasonPhrase}.";
+                            try
                             {
-                                string errorMessage = error.ErrorCode > 0
-                                    ? $"Error code: {error.ErrorCode}. Message: {error.Message}."
-                                    : $"Message: {error.Message}.";
-                                throw new Exception(errorMessage);
+                                var error = Converter.Deserialize<ServiceError>(responseText);
+                                if (error?.ErrorCode > 0 || !string.IsNullOrWhiteSpace(error?.Message))
+                                {
+                                    errorMessage = error.ErrorCode > 0
+                                        ? $"Error code: {error.ErrorCode}. Message: {error.Message}."
+                                        : $"Message: {error.Message}.";
+                                }
                             }
+                            catch { }
+                            throw new Exception(errorMessage);
                         }
 
                         return responseText;