diff --git a/lib/Slic3r/Config.pm b/lib/Slic3r/Config.pm
index 3f4146622..1a391219d 100644
--- a/lib/Slic3r/Config.pm
+++ b/lib/Slic3r/Config.pm
@@ -315,8 +315,9 @@ sub load {
         my $key = $1;
         if (!exists $Options->{$key}) {
             $key = +(grep { $Options->{$_}{aliases} && grep $_ eq $key, @{$Options->{$_}{aliases}} }
-                keys %$Options)[0] or die "Unknown option $1 at line $.\n";
+                keys %$Options)[0] or warn "Unknown option $1 at line $.\n";
         }
+        next unless $key;
         my $opt = $Options->{$key};
         set($key, $opt->{deserialize} ? $opt->{deserialize}->($2) : $2);
     }
diff --git a/lib/Slic3r/GUI/SkeinPanel.pm b/lib/Slic3r/GUI/SkeinPanel.pm
index 5c308674e..bc8f27192 100644
--- a/lib/Slic3r/GUI/SkeinPanel.pm
+++ b/lib/Slic3r/GUI/SkeinPanel.pm
@@ -159,11 +159,7 @@ sub do_slice {
             },
         );
         {
-            local $SIG{__WARN__} = sub {
-                my $message = shift;
-                Wx::MessageDialog->new($self, $message, 'Warning', 
-                    wxOK | wxICON_WARNING)->ShowModal;
-            };
+            local $SIG{__WARN__} = $self->catch_warning;
             $skein->go;
         }
         $process_dialog->Destroy;
@@ -205,6 +201,7 @@ sub load_config {
         my ($file) = $dlg->GetPaths;
         $last_dir = dirname($file);
         eval {
+            local $SIG{__WARN__} = $self->catch_warning;
             Slic3r::Config->load($file);
         };
         $self->catch_error();
@@ -220,4 +217,12 @@ sub catch_error {
     }
 }
 
+sub catch_warning {
+    my ($self) = @_;
+    return sub {
+        my $message = shift;
+        Wx::MessageDialog->new($self, $message, 'Warning', wxOK | wxICON_WARNING)->ShowModal;
+    };
+};
+
 1;