diff --git a/lib/latest.lib.php b/lib/latest.lib.php
index da89910d1..f374ae899 100644
--- a/lib/latest.lib.php
+++ b/lib/latest.lib.php
@@ -31,7 +31,7 @@ function latest($skin_dir='', $bo_table, $rows=10, $subject_len=40, $cache_time=
         }
     }
 
-    $caches = null;
+    $caches = false;
 
     if(G5_USE_CACHE) {
         $cache_file_name = "latest-{$bo_table}-{$skin_dir}-{$rows}-{$subject_len}-".g5_cache_secret_key();