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-rw-r--r--src/nxt_router.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/nxt_router.c b/src/nxt_router.c
index bbd9a54e..6277bd47 100644
--- a/src/nxt_router.c
+++ b/src/nxt_router.c
@@ -3787,7 +3787,7 @@ nxt_router_response_ready_handler(nxt_task_t *task, nxt_port_recv_msg_t *msg,
nxt_http_request_send_body(task, r, NULL);
} else {
- size_t b_size = nxt_buf_mem_used_size(&b->mem);
+ size_t b_size = nxt_buf_is_mem(b) ? nxt_buf_mem_used_size(&b->mem) : 0;
if (nxt_slow_path(b_size < sizeof(*resp))) {
goto fail;