diff --git a/agrirouter-sdk-dotnet-standard-api/agrirouter-sdk-dotnet-standard-api.csproj b/agrirouter-sdk-dotnet-standard-api/agrirouter-sdk-dotnet-standard-api.csproj
index fc43faf..8b4b228 100644
--- a/agrirouter-sdk-dotnet-standard-api/agrirouter-sdk-dotnet-standard-api.csproj
+++ b/agrirouter-sdk-dotnet-standard-api/agrirouter-sdk-dotnet-standard-api.csproj
@@ -11,8 +11,8 @@
         <PackageProjectUrl>https://github.com/DKE-Data/agrirouter-sdk-dotnet-standard</PackageProjectUrl>
         <PackageLicenseUrl>https://github.com/DKE-Data/agrirouter-sdk-dotnet-standard/blob/develop/LICENSE</PackageLicenseUrl>
         <RepositoryUrl>https://github.com/DKE-Data/agrirouter-sdk-dotnet-standard</RepositoryUrl>
-        <PackageVersion>3.9.0</PackageVersion>
-        <AssemblyVersion>3.9.0</AssemblyVersion>
+        <PackageVersion>3.9.1</PackageVersion>
+        <AssemblyVersion>3.9.1</AssemblyVersion>
         <Company>DKE-Data GmbH &amp; Co. KG</Company>
     </PropertyGroup>
 
diff --git a/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/OnboardService.cs b/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/OnboardService.cs
index 66fddc5..5247384 100644
--- a/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/OnboardService.cs
+++ b/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/OnboardService.cs
@@ -70,7 +70,12 @@ public OnboardResponse Onboard(OnboardParameters onboardParameters)
 
             if (!httpResponseMessage.IsSuccessStatusCode) {
                 var onboardErrorResponse = JsonConvert.DeserializeObject<OnboardErrorResponse>(result);
-                throw new OnboardException(httpResponseMessage.StatusCode, onboardErrorResponse.OnboardError);
+                throw new OnboardException(httpResponseMessage.StatusCode, onboardErrorResponse?.OnboardError ?? new OnboardError()
+                {
+                    Code = "Unstructured",
+                    Message = result
+                }
+                    );
             }
 
             var onboardingResponse = JsonConvert.DeserializeObject(result, typeof(OnboardResponse));
diff --git a/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/RevokeService.cs b/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/RevokeService.cs
index 5542e1e..1e2706c 100644
--- a/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/RevokeService.cs
+++ b/agrirouter-sdk-dotnet-standard-impl/Service/Onboard/RevokeService.cs
@@ -63,7 +63,8 @@ public void Revoke(RevokeParameters revokeParameters, string privateKey)
             var httpResponseMessage = _httpClient.SendAsync(httpRequestMessage).Result;
 
             if (!httpResponseMessage.IsSuccessStatusCode) {
-                var onboardErrorResponse = JsonConvert.DeserializeObject<OnboardErrorResponse>(httpResponseMessage.Content.ReadAsStringAsync().Result);
+                var result = httpResponseMessage.Content.ReadAsStringAsync().Result;
+                var onboardErrorResponse = JsonConvert.DeserializeObject<OnboardErrorResponse>(result);
                 throw new RevokeException(httpResponseMessage.StatusCode, onboardErrorResponse.OnboardError);
             }
         }
diff --git a/agrirouter-sdk-dotnet-standard-impl/agrirouter-sdk-dotnet-standard-impl.csproj b/agrirouter-sdk-dotnet-standard-impl/agrirouter-sdk-dotnet-standard-impl.csproj
index 32076fd..1e733b1 100644
--- a/agrirouter-sdk-dotnet-standard-impl/agrirouter-sdk-dotnet-standard-impl.csproj
+++ b/agrirouter-sdk-dotnet-standard-impl/agrirouter-sdk-dotnet-standard-impl.csproj
@@ -11,8 +11,8 @@
         <PackageProjectUrl>https://github.com/DKE-Data/agrirouter-sdk-dotnet-standard</PackageProjectUrl>
         <PackageLicenseUrl>https://github.com/DKE-Data/agrirouter-sdk-dotnet-standard/blob/develop/LICENSE</PackageLicenseUrl>
         <RepositoryUrl>https://github.com/DKE-Data/agrirouter-sdk-dotnet-standard</RepositoryUrl>
-        <PackageVersion>3.9.0</PackageVersion>
-        <AssemblyVersion>3.9.0</AssemblyVersion>
+        <PackageVersion>3.9.1</PackageVersion>
+        <AssemblyVersion>3.9.1</AssemblyVersion>
         <Company>DKE-Data GmbH &amp; Co. KG</Company>
     </PropertyGroup>