diff --git a/RESTFulSense/Controllers/RESTFulController.cs b/RESTFulSense/Controllers/RESTFulController.cs
index a4302099..5d1d9aa5 100644
--- a/RESTFulSense/Controllers/RESTFulController.cs
+++ b/RESTFulSense/Controllers/RESTFulController.cs
@@ -742,7 +742,10 @@ private void MapExceptionDataToProblemDetail(
 
                 problemDetail.Errors.Add(
                     key: errorKey,
-                    value: ((List<string>)error.Value)?.ToArray());
+
+                    value: error.Value.GetType() == typeof(List<string>)
+                        ? ((List<string>)error.Value)?.ToArray()
+                        : (string[]) error.Value);
             }
         }
 
diff --git a/RESTFulSense/RESTFulSense.csproj b/RESTFulSense/RESTFulSense.csproj
index df067c7e..a63a4168 100644
--- a/RESTFulSense/RESTFulSense.csproj
+++ b/RESTFulSense/RESTFulSense.csproj
@@ -11,9 +11,9 @@
 		<PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
 		<PackageIcon>api.png</PackageIcon>
 		<PackageIconUrl />
-		<Version>2.19</Version>
-		<AssemblyVersion>2.19.0.0</AssemblyVersion>
-		<FileVersion>2.19.0.0</FileVersion>
+		<Version>2.20</Version>
+		<AssemblyVersion>2.20.0.0</AssemblyVersion>
+		<FileVersion>2.20.0.0</FileVersion>
 		<NeutralLanguage>en-US</NeutralLanguage>
 		<PackageLicenseExpression></PackageLicenseExpression>
 		<PackageProjectUrl>https://www.restfulsense.net</PackageProjectUrl>