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-rw-r--r--util/stanza.lua2
1 files changed, 2 insertions, 0 deletions
diff --git a/util/stanza.lua b/util/stanza.lua
index 24fd4fea..8ff1aae3 100644
--- a/util/stanza.lua
+++ b/util/stanza.lua
@@ -450,6 +450,8 @@ local xmpp_stanzas_attr = { xmlns = xmlns_stanzas };
local function error_reply(orig, error_type, condition, error_message)
if not is_stanza(orig) then
error("bad argument to error_reply: expected stanza, got "..type(orig));
+ elseif orig.attr.type == "error" then
+ error("bad argument to error_reply: got stanza of type error which must not be replied to");
end
local t = reply(orig);
t.attr.type = "error";