diff --git a/package-lock.json b/package-lock.json
index 1cde174..13b66e7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1981,9 +1981,9 @@
       "integrity": "sha512-nWev387pHxeBHtOu0EvRTVQ0/JeJL44Ew0PzQaiqHsC5mghkJ6ok7z22nk9nmuZ7lONxGJmW7CHT8X8lyviZJg=="
     },
     "@ucap/protocol": {
-      "version": "0.0.16",
-      "resolved": "http://10.81.13.221:8081/nexus/repository/npm-all/@ucap/protocol/-/protocol-0.0.16.tgz",
-      "integrity": "sha512-Ly99SjR550YFr9NEJ2LrJ0TvmzjDI3V7fsHyUt6ZPmwMOkVY99KA0t6CteDUa5fWbUCLoM38ZI68venAQlstUQ=="
+      "version": "0.0.17",
+      "resolved": "http://10.81.13.221:8081/nexus/repository/npm-all/@ucap/protocol/-/protocol-0.0.17.tgz",
+      "integrity": "sha512-ax3vOvVmoynxZlqtl5oNqrsbbOJJ5BQt1k9qqPuDomtXlHpYLS1eVdXPHzICaP4ysZwtcUK4Hd2xGIb2Pe8j5Q=="
     },
     "@ucap/protocol-authentication": {
       "version": "0.0.5",
@@ -2026,9 +2026,9 @@
       "integrity": "sha512-IuFzc8BTGt3CegTm8DNBDa65/hDnFYaUehkv+bbXvsebUUwy8ttpIVm1yi57jl4AQCyYLqxEW0YotCxnICOARA=="
     },
     "@ucap/protocol-ping": {
-      "version": "0.0.5",
-      "resolved": "http://10.81.13.221:8081/nexus/repository/npm-all/@ucap/protocol-ping/-/protocol-ping-0.0.5.tgz",
-      "integrity": "sha512-lr/NZYyPL52xWnEWDq6ex6X+BdpELBn8j66/kFeoJgftLnv0zsWJh47948hbpLlrolE+wHd8Ncb1fw3bbjhCjw=="
+      "version": "0.0.6",
+      "resolved": "http://10.81.13.221:8081/nexus/repository/npm-all/@ucap/protocol-ping/-/protocol-ping-0.0.6.tgz",
+      "integrity": "sha512-CF3hes/Lv0syVSXfN7QkfUIEf1i9yhVaq4THlAR4Bxt+vW1LrXz+t16VDEn7ehBSh+luEKGSkkMEZAG16wu4Rw=="
     },
     "@ucap/protocol-query": {
       "version": "0.0.5",
diff --git a/package.json b/package.json
index 0b94e33..c1ea20a 100644
--- a/package.json
+++ b/package.json
@@ -79,7 +79,7 @@
     "@ucap/ng-ui-authentication": "~0.0.15",
     "@ucap/ng-ui-skin-default": "~0.0.1",
     "@ucap/pi": "~0.0.5",
-    "@ucap/protocol": "~0.0.16",
+    "@ucap/protocol": "~0.0.17",
     "@ucap/protocol-authentication": "~0.0.5",
     "@ucap/protocol-buddy": "~0.0.5",
     "@ucap/protocol-event": "~0.0.5",
@@ -88,7 +88,7 @@
     "@ucap/protocol-info": "~0.0.5",
     "@ucap/protocol-inner": "~0.0.4",
     "@ucap/protocol-option": "~0.0.7",
-    "@ucap/protocol-ping": "~0.0.5",
+    "@ucap/protocol-ping": "~0.0.6",
     "@ucap/protocol-query": "~0.0.5",
     "@ucap/protocol-room": "~0.0.5",
     "@ucap/protocol-service": "~0.0.4",
diff --git a/src/app/services/app.service.ts b/src/app/services/app.service.ts
index d171d9b..2ffcb1b 100644
--- a/src/app/services/app.service.ts
+++ b/src/app/services/app.service.ts
@@ -149,6 +149,9 @@ export class AppService {
     const initProtocol = new Promise<void>(async (resolve, reject) => {
       try {
         this.protocolService.connected$.subscribe((connected) => {
+          if (undefined === connected) {
+            return;
+          }
           if (connected) {
             this.appAuthenticationService
               .createSession()