diff --git a/src/uws/service/error/DefaultUWSErrorWriter.java b/src/uws/service/error/DefaultUWSErrorWriter.java
index 70c51351dd23f4284a6fc10f4757fb26ba30c39c..f9854a45268be0311ba30205dce08abc51e82a65 100644
--- a/src/uws/service/error/DefaultUWSErrorWriter.java
+++ b/src/uws/service/error/DefaultUWSErrorWriter.java
@@ -110,7 +110,7 @@ public class DefaultUWSErrorWriter implements ServiceErrorWriter {
 
 	@Override
 	public void writeError(String message, ErrorType type, int httpErrorCode, HttpServletResponse response, HttpServletRequest request, String reqID, JobOwner user, String action) throws IOException{
-		if (message != null || response != null)
+		if (message == null || response == null)
 			return;
 
 		// Just format and write the error message: