diff --git a/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java b/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
index 7f075b1..6560a1b 100644
--- a/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
+++ b/webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java
@@ -402,6 +402,7 @@ public class Spider implements Runnable, Task {
         if (page == null) {
             sleep(site.getSleepTime());
             onError(request);
+            return;
         }
         // for cycle retry
         if (page.isNeedCycleRetry()) {
diff --git a/webmagic-extension/src/main/java/us/codecraft/webmagic/example/PatternProcessorExample.java b/webmagic-extension/src/main/java/us/codecraft/webmagic/example/PatternProcessorExample.java
index f6b2e9b..8ecb08f 100644
--- a/webmagic-extension/src/main/java/us/codecraft/webmagic/example/PatternProcessorExample.java
+++ b/webmagic-extension/src/main/java/us/codecraft/webmagic/example/PatternProcessorExample.java
@@ -54,7 +54,7 @@ public class PatternProcessorExample {
             }
         };
 
-        CompositePageProcessor pageProcessor = new CompositePageProcessor(Site.me().setDomain("github.com").setRetryTimes(0).setSleepTime(0));
+        CompositePageProcessor pageProcessor = new CompositePageProcessor(Site.me().setDomain("github.com").setRetryTimes(3));
         CompositePipeline pipeline = new CompositePipeline();
 
         pageProcessor.setSubPageProcessors(githubRepoProcessor, githubUserProcessor);