diff --git a/ganttzk/src/main/java/org/zkoss/ganttz/util/LongOperationFeedback.java b/ganttzk/src/main/java/org/zkoss/ganttz/util/LongOperationFeedback.java
index ff35a0c8b..98e4b48e2 100644
--- a/ganttzk/src/main/java/org/zkoss/ganttz/util/LongOperationFeedback.java
+++ b/ganttzk/src/main/java/org/zkoss/ganttz/util/LongOperationFeedback.java
@@ -266,7 +266,7 @@ public class LongOperationFeedback {
                 if (current.isEnd()) {
                     return;
                 }
-                if (!desktop.isAlive()) {
+                if (!desktop.isAlive() || !desktop.isServerPushEnabled()) {
                     return;
                 }
                 try {