diff --git a/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/GuessManagement.java b/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/GuessManagement.java
index ba99844883..a8cae5b72b 100644
--- a/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/GuessManagement.java
+++ b/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/GuessManagement.java
@@ -57,7 +57,7 @@ public GuessSchema guessSchema(AdapterDescription adapterDescription)
     var description = objectMapper.writeValueAsString(adapterDescription);
     logger.info("Guess schema at: " + workerUrl);
     Response requestResponse = ExtensionServiceExecutions
-        .extServicePostRequest(workerUrl, null, description)
+        .extServicePostRequest(workerUrl, description)
         .execute();
 
     var httpResponse = requestResponse.returnResponse();