lua: added typecheck for string-to-dname conversion

diff --git a/daemon/lua/kres.lua b/daemon/lua/kres.lua
index 9dc647f87202b95793215ab1a52ee508e10c9fee..5faabbd8ad9fe067e1a6faaa6b6e07ac7ee410a0 100644 (file)
--- a/daemon/lua/kres.lua
+++ b/daemon/lua/kres.lua
@@ -649,6 +649,7 @@ kres = {
        request_t = function (udata) return ffi.cast('struct kr_request *', udata) end,
        -- Global API functions
        str2dname = function(name)
+               if type(name) ~= 'string' then return end
                local dname = ffi.gc(C.knot_dname_from_str(nil, name, 0), C.free)
                return dname2wire(dname)
        end,