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-rw-r--r--util/set.lua6
1 files changed, 4 insertions, 2 deletions
diff --git a/util/set.lua b/util/set.lua
index e4cc2dff..050446ec 100644
--- a/util/set.lua
+++ b/util/set.lua
@@ -82,8 +82,10 @@ function new(list)
end
function set:add_list(list)
- for _, item in ipairs(list) do
- items[item] = true;
+ if list then
+ for _, item in ipairs(list) do
+ items[item] = true;
+ end
end
end