diff --git a/src/fr/devinsy/statoolinfos/crawl/CrawlCache.java b/src/fr/devinsy/statoolinfos/crawl/CrawlCache.java
index ef2bd3f..e83c6d1 100644
--- a/src/fr/devinsy/statoolinfos/crawl/CrawlCache.java
+++ b/src/fr/devinsy/statoolinfos/crawl/CrawlCache.java
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2020 Christian Pierre MOMON <christian@momon.org>
+ * Copyright (C) 2020-2021 Christian Pierre MOMON <christian@momon.org>
  * 
  * This file is part of StatoolInfos, simple service statistics tool.
  * 
@@ -21,6 +21,7 @@ package fr.devinsy.statoolinfos.crawl;
 import java.io.File;
 import java.io.IOException;
 import java.net.URL;
+import java.nio.file.Files;
 
 import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.commons.io.FileUtils;
@@ -389,7 +390,17 @@ public class CrawlCache
         {
             final int TIMEOUT = 5000;
             result = buildFile(url.toString());
-            FileUtils.copyURLToFile(url, result, TIMEOUT, TIMEOUT);
+            File temp = Files.createTempFile("tmp-", ".statoolsinfos").toFile();
+            FileUtils.copyURLToFile(url, temp, TIMEOUT, TIMEOUT);
+            if (temp.length() == 0)
+            {
+                logger.warn("WARNING: empty file crawled for [{}]", url);
+            }
+            else
+            {
+                temp.renameTo(result);
+            }
+            temp.delete();
         }
         else
         {