diff --git a/plugin/src/main/java/org/opensearch/ml/rest/RestMLUpdateConnectorAction.java b/plugin/src/main/java/org/opensearch/ml/rest/RestMLUpdateConnectorAction.java
index 2957740354..0b47b39029 100644
--- a/plugin/src/main/java/org/opensearch/ml/rest/RestMLUpdateConnectorAction.java
+++ b/plugin/src/main/java/org/opensearch/ml/rest/RestMLUpdateConnectorAction.java
@@ -16,6 +16,7 @@
 import java.util.List;
 import java.util.Locale;
 
+import org.opensearch.OpenSearchParseException;
 import org.opensearch.client.node.NodeClient;
 import org.opensearch.core.xcontent.XContentParser;
 import org.opensearch.ml.common.transport.connector.MLUpdateConnectorAction;
@@ -68,9 +69,12 @@ private MLUpdateConnectorRequest getRequest(RestRequest request) throws IOExcept
 
         String connectorId = getParameterId(request, PARAMETER_CONNECTOR_ID);
 
-        XContentParser parser = request.contentParser();
-        ensureExpectedToken(XContentParser.Token.START_OBJECT, parser.nextToken(), parser);
-
-        return MLUpdateConnectorRequest.parse(parser, connectorId);
+        try {
+            XContentParser parser = request.contentParser();
+            ensureExpectedToken(XContentParser.Token.START_OBJECT, parser.nextToken(), parser);
+            return MLUpdateConnectorRequest.parse(parser, connectorId);
+        } catch (IllegalStateException illegalStateException) {
+            throw new OpenSearchParseException(illegalStateException.getMessage());
+        }
     }
 }