p2p/discv5: fix topic register panic at shutdown (#15946)

397c6cde · Felföldi Zsolt · Péter Szilágyi · 302c17c3 · 397c6cde
Commit 397c6cde authored Jan 23, 2018 by Felföldi Zsolt Committed by Péter Szilágyi Jan 23, 2018
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ticket.go p2p/discv5/ticket.go +1 -1

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--- a/p2p/discv5/ticket.go
+++ b/p2p/discv5/ticket.go
@@ -350,7 +350,7 @@ func (s *ticketStore) nextFilteredTicket() (*ticketRef, time.Duration) {

 		regTime := now + mclock.AbsTime(wait)
 		topic := ticket.t.topics[ticket.idx]
-		if regTime >= s.tickets[topic].nextReg {
+		if s.tickets[topic] != nil && regTime >= s.tickets[topic].nextReg {
 			return ticket, wait
 		}
 		s.removeTicketRef(*ticket)