diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 3bf47b7da7a..e8b2e437342 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -1975,7 +1975,7 @@ function dol_print_date($time, $format = '', $tzoutput = 'auto', $outputlangs =
 {
 	global $conf, $langs;
 
-	if ($tzoutput == 'auto') {
+	if ($tzoutput == 'auto' && property_exists($conf,'tzuserinputkey')) {
 		$tzoutput = $conf->tzuserinputkey;
 	}