diff --git a/version.inc.php b/version.inc.php
index 884f299..367985a 100644
--- a/version.inc.php
+++ b/version.inc.php
@@ -90,8 +90,10 @@ function get_version_file_lifetime()
 {
   global $GAME_ROOT;
   
-  exec("git log --follow --format=%ad --date=format:'%Y-%m-%d %H:%M:%S' " . $GAME_ROOT . "/VERSION" , $creating_timestamp);
-  $minutes = (time() - strtotime($creating_timestamp[0])) / 60;
+  exec("git log --follow --format=%ad --date=format:'%Y-%m-%d %H:%M:%S' " . $GAME_ROOT . "/VERSION" , $out, $ret);
+  if($ret != 0)
+    throw new Exception("git error");
+  $minutes = (time() - strtotime($out[0])) / 60;
  
   return ceil($minutes);
 }
\ No newline at end of file