diff --git a/PVE/Auth/PVE.pm b/PVE/Auth/PVE.pm
index 7147997..8714a6b 100755
--- a/PVE/Auth/PVE.pm
+++ b/PVE/Auth/PVE.pm
@@ -19,6 +19,8 @@ sub parse_shadow_passwd {
 
     my $shadow = {};
 
+    return $shadow if !defined($raw);
+
     while ($raw =~ /^\s*(.+?)\s*$/gm) {
 	my $line = $1;