diff --git a/PVE/Storage/PBSPlugin.pm b/PVE/Storage/PBSPlugin.pm
index 603529f..633c399 100644
--- a/PVE/Storage/PBSPlugin.pm
+++ b/PVE/Storage/PBSPlugin.pm
@@ -403,7 +403,8 @@ sub prune_backups {
 
     $logfunc //= sub { print "$_[1]\n" };
 
-    my $backups = $class->list_volumes($storeid, $scfg, $vmid, ['backup']);
+    my $backups = eval { $class->list_volumes($storeid, $scfg, $vmid, ['backup']) };
+    die "failed to get list of all backups to prune - $@" if $@;
 
     $type = 'vm' if defined($type) && $type eq 'qemu';
     $type = 'ct' if defined($type) && $type eq 'lxc';
@@ -411,7 +412,6 @@ sub prune_backups {
     my $backup_groups = {};
     foreach my $backup (@{$backups}) {
 	(my $backup_type = $backup->{format}) =~ s/^pbs-//;
-
 	next if defined($type) && $backup_type ne $type;
 
 	my $backup_group = "$backup_type/$backup->{vmid}";