diff --git a/lib/contents.php b/lib/contents.php
index 454f2066..12a98b0c 100644
--- a/lib/contents.php
+++ b/lib/contents.php
@@ -140,7 +140,7 @@ function getContents(
     $cache->setScope('server');
     $cache->setKey([$url]);
 
-    if (!Debug::isEnabled() && $cache->getTime()) {
+    if (!Debug::isEnabled() && $cache->getTime() && $cache->loadData(86400 * 7)) {
         $config['if_not_modified_since'] = $cache->getTime();
     }