diff --git a/ASCIIToSVG.php b/ASCIIToSVG.php
index 644b446..75af20a 100644
--- a/ASCIIToSVG.php
+++ b/ASCIIToSVG.php
@@ -1767,7 +1767,7 @@ public static function loadObjects() {
         $file = "{$dir}/{$ent}";
         $base = substr($ent, 0, -5);
         if (substr($ent, -5) == '.path' && is_readable($file)) {
-          if (isset(self::$objects[$base]) &&
+          if (isset(self::$objects[$base]) && isset(self::$cacheTime) &&
               filemtime($file) <= self::$cacheTime) {
             continue;
           }