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-rw-r--r--src/protocol/pair/pair.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/protocol/pair/pair.c b/src/protocol/pair/pair.c
index cc906791..f86a9fa7 100644
--- a/src/protocol/pair/pair.c
+++ b/src/protocol/pair/pair.c
@@ -102,6 +102,9 @@ nni_pair_pipe_add(void *arg)
nni_pair_pipe *pp = arg;
nni_pair_sock *pair = pp->pair;
+ if (nni_pipe_peer(pp->pipe) != NNG_PROTO_PAIR) {
+ return (NNG_EPROTO);
+ }
if (pair->pipe != NULL) {
return (NNG_EBUSY); // Already have a peer, denied.
}