diff --git a/src/proxy/tcp_proxy_client.c b/src/proxy/tcp_proxy_client.c
index d47c4409..17ce289e 100644
--- a/src/proxy/tcp_proxy_client.c
+++ b/src/proxy/tcp_proxy_client.c
@@ -470,7 +470,8 @@ static void tcp_proxy_client_handle_fin(struct tcp_proxy_client* p, uint32_t str
     if (!pc || !pc->pcb) return;
     DEBUG_INFO(DEBUG_CATEGORY_SOCKET, "PROXY FIN FROM exit sid=%08x — shutdown read", stream_id);
     pc->fin_remote = 1;
-    tcp_shutdown(pc->pcb, 0, 1);
+    if (pc->pcb->state != TIME_WAIT && pc->pcb->state != CLOSED)
+        tcp_shutdown(pc->pcb, 0, 1);
     if (pc->fin_local && !pc->close_sent && !pc->close_pending)
         tcp_proxy_client_send_close(pc);
 }