Fix segmentation fault in oned service when configured to cache mode. #6301
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Issue #6302
Description
After setting federation mode to be "CACHE" the XML/RPC server crash on segmentation fault.
To Reproduce
Detailes
Program crashed when trying to call hm->trigger_send_event in Request.cc (hm is null).
Before :
After:
When nebula is cache HookManager isn't initialize, therfore
hm
equals to null.