diff --git a/data/PVE/INotify.pm b/data/PVE/INotify.pm
index f18a10b..c6a736d 100644
--- a/data/PVE/INotify.pm
+++ b/data/PVE/INotify.pm
@@ -978,7 +978,7 @@ sub read_apt_auth {
 
     local $/;
 
-    my $raw = <$fd>;
+    my $raw = defined($fd) ? <$fd> : '';
 
     $raw =~ s/^\s+//;