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-rw-r--r--src/plugins/nat/nat.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/plugins/nat/nat.c b/src/plugins/nat/nat.c
index 8aecac6d3ff..b13c8571020 100644
--- a/src/plugins/nat/nat.c
+++ b/src/plugins/nat/nat.c
@@ -726,7 +726,8 @@ int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
kv.key = m_key.as_u64;
kv.value = m - sm->static_mappings;
clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 1);
- locals[i].prefix = locals[i - 1].prefix + locals[i].probability;
+ locals[i].prefix = (i == 0) ? locals[i].probability :\
+ (locals[i - 1].prefix + locals[i].probability);
vec_add1 (m->locals, locals[i]);
m_key.port = clib_host_to_net_u16 (locals[i].port);
kv.key = m_key.as_u64;