diff --git a/zktest/src/test/java/org/zkoss/zktest/zats/test2/B100_ZK_5650Test.java b/zktest/src/test/java/org/zkoss/zktest/zats/test2/B100_ZK_5650Test.java
index 8ad96f6924..f6c7a0da5f 100644
--- a/zktest/src/test/java/org/zkoss/zktest/zats/test2/B100_ZK_5650Test.java
+++ b/zktest/src/test/java/org/zkoss/zktest/zats/test2/B100_ZK_5650Test.java
@@ -33,6 +33,7 @@ public void test() throws Exception {
 		waitResponse();
 		dropUploadFile(jq("@dropupload"), Paths.get("src/main/webapp/test2/img/sun.jpg"));
 		waitResponse();
+		assertNoAnyError();
 		assertEquals("sun.jpg", getZKLog());
 	}
 }