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-rw-r--r--src/or/rephist.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/src/or/rephist.c b/src/or/rephist.c
index 1bee6459cc..55f321d5ff 100644
--- a/src/or/rephist.c
+++ b/src/or/rephist.c
@@ -310,9 +310,10 @@ rep_hist_note_router_reachable(const char *id, const tor_addr_t *at_addr,
tor_assert(hist);
tor_assert((!at_addr && !at_port) || (at_addr && at_port));
- addr_changed = at_addr &&
+ addr_changed = at_addr && !tor_addr_is_null(&hist->last_reached_addr) &&
tor_addr_compare(at_addr, &hist->last_reached_addr, CMP_EXACT) != 0;
- port_changed = at_port && at_port != hist->last_reached_port;
+ port_changed = at_port && hist->last_reached_port &&
+ at_port != hist->last_reached_port;
if (!started_tracking_stability)
started_tracking_stability = time(NULL);