diff --git a/web-server/app/middleware/proxy.ts b/web-server/app/middleware/proxy.ts
index a0bd92c84..f92859f15 100644
--- a/web-server/app/middleware/proxy.ts
+++ b/web-server/app/middleware/proxy.ts
@@ -32,7 +32,7 @@ module.exports = () => {
             let url = getProxyUrl(ctx.request.url);
             if(url) {
                 let sid = getServerId(url, ctx);
-                if(!ctx.app.config.sidToHost) {
+                if(!ctx.app.config.sidToHost.has(sid)) {
                     await getNewHost(sid);
                 }
                 if(!!ctx.app.config.sidToHost.get(sid)) {