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Fixes alert utils nil value

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This commit is contained in:
Matteo Biscosi 2021-03-09 09:43:50 +01:00
parent 2df2ae82df
commit 4a5f8f8a08
1 changed files with 7 additions and 1 deletions
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8
scripts/lua/modules/alert_utils.lua
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@ -813,7 +813,13 @@ function alert_utils.housekeepingAlertsMakeRoom(ifId)
if ntop.getCache(k["flows"]) == "1" then
ntop.delCache(k["flows"])
local res = interface.queryFlowAlertsRaw("SELECT count(*) count") or {}
local count = tonumber(res[1].count)
local count = nil
-- res can be an empty table, so a check is needed
if table.len(res) >= 2 then
count = tonumber(res[1].count)
end
if count ~= nil and count >= max_num_flow_alerts then
local to_keep = (max_num_flow_alerts * 0.8)
to_keep = round(to_keep, 0)