diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 90532e5ee1e..d6b67088e78 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -1977,7 +1977,7 @@ function dol_print_date($time, $format = '', $tzoutput = 'auto', $outputlangs =
 	global $conf, $langs;
 
 	if ($tzoutput == 'auto') {
-		$tzoutput = $conf->tzuserinputkey;
+		$tzoutput = (empty($conf) ? 'tzserver' : $conf->tzuserinputkey);
 	}
 
 	// Clean parameters