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-rw-r--r--misc/freeswitch/scripts/common/group.lua4
1 files changed, 4 insertions, 0 deletions
diff --git a/misc/freeswitch/scripts/common/group.lua b/misc/freeswitch/scripts/common/group.lua
index 1763e69..b9cae61 100644
--- a/misc/freeswitch/scripts/common/group.lua
+++ b/misc/freeswitch/scripts/common/group.lua
@@ -152,6 +152,10 @@ end
function Group.intersection(self, set_one, set_two)
+ if not set_one or not set_two then
+ return {};
+ end
+
local basic_set = {};
for index=1, #set_one do
basic_set[set_one[index]] = true;