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-rw-r--r--util/filters.lua2
1 files changed, 2 insertions, 0 deletions
diff --git a/util/filters.lua b/util/filters.lua
index d24bd33e..6290e53b 100644
--- a/util/filters.lua
+++ b/util/filters.lua
@@ -45,6 +45,8 @@ function add_filter(session, type, callback, priority)
if not filter_list then
filter_list = {};
session.filters[type] = filter_list;
+ elseif filter_list[callback] then
+ return; -- Filter already added
end
priority = priority or 0;