1 files changed, 1 insertions, 1 deletions
diff --git a/lib.php b/lib.php
index 213d9cc..f6621a8 100644
--- a/lib.php
+++ b/lib.php
@@ -225,7 +225,7 @@ function key2timestamp($key) {
     global $tz;
 
     $date = DateTime::createFromFormat("YmdHis", $key+0, $tz);
-    if ($date <= 0)
+    if ($date === false)
         return null;
 
     return $date->getTimestamp();