diff --git a/Pilz.Net/Api/ApiServer.cs b/Pilz.Net/Api/ApiServer.cs
index 71df069..51b5504 100644
--- a/Pilz.Net/Api/ApiServer.cs
+++ b/Pilz.Net/Api/ApiServer.cs
@@ -507,7 +507,11 @@ public class ApiServer : IApiServer
         // Read input content
         Log.Debug("Read input content");
         ApiMessage? message = null;
-        switch (context.Request.ContentType)
+        var contentType = context.Request.ContentType;
+        var contentTypeEnd = contentType?.IndexOf(';') ?? -1;
+        if (contentType != null && contentTypeEnd != -1)
+            contentType = contentType[..contentTypeEnd];
+        switch (contentType)
         {
             case "application/json":
                 try
@@ -515,9 +519,8 @@ public class ApiServer : IApiServer
                     Log.Debug("Deserialize message");
                     using StreamReader input = new(context.Request.InputStream);
                     var contentJson = input.ReadToEnd();
-                    if (targetType == null)
-                        return null;
-                    message = serializer.Deserialize(contentJson, targetType);
+                    if (targetType != null)
+                        message = serializer.Deserialize(contentJson, targetType);
                 }
                 catch (OutOfMemoryException)
                 {
diff --git a/Pilz.Net/Pilz.Net.csproj b/Pilz.Net/Pilz.Net.csproj
index 522da93..ddcc16a 100644
--- a/Pilz.Net/Pilz.Net.csproj
+++ b/Pilz.Net/Pilz.Net.csproj
@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <PropertyGroup>
-    <Version>2.11.3</Version>
+    <Version>2.11.4</Version>
   </PropertyGroup>
   
   <ItemGroup>