diff --git a/src/ngx_http_lua_util.c b/src/ngx_http_lua_util.c
index 727ca3da39..f1e0cd08f5 100644
--- a/src/ngx_http_lua_util.c
+++ b/src/ngx_http_lua_util.c
@@ -549,6 +549,10 @@ ngx_http_lua_send_header_if_needed(ngx_http_request_t *r,
         if (!ctx->buffering) {
             dd("sending headers");
             rc = ngx_http_send_header(r);
+            if (r->filter_finalize) {
+                ngx_http_set_ctx(r, ctx, ngx_http_lua_module);
+            }
+
             ctx->header_sent = 1;
             return rc;
         }
diff --git a/t/002-content.t b/t/002-content.t
index 54de40ebd5..eb9d587f89 100644
--- a/t/002-content.t
+++ b/t/002-content.t
@@ -1098,3 +1098,25 @@ failed to load inlined Lua code: content_by_lua(...45678901234567890123456789012
 GET /lua
 --- response_body_like: 503 Service Temporarily Unavailable
 --- error_code: 503
+
+
+
+=== TEST 52: send_header trigger filter finalize does not clear the ctx
+--- config
+    location /lua {
+        content_by_lua_block {
+            ngx.header["Last-Modified"] = ngx.http_time(ngx.time())
+            ngx.send_headers()
+            local phase = ngx.get_phase()
+        }
+        header_filter_by_lua_block {
+            ngx.header["X-Hello-World"] = "Hello World"
+        }
+    }
+--- request
+GET /lua
+--- more_headers
+If-Unmodified-Since: Wed, 01 Jan 2020 07:28:00 GMT
+--- error_code: 412
+--- no_error_log
+unknown phase: 0