diff --git a/backend/src/schema/resolvers/rooms.spec.ts b/backend/src/schema/resolvers/rooms.spec.ts
index d27c64e57..03c3d4456 100644
--- a/backend/src/schema/resolvers/rooms.spec.ts
+++ b/backend/src/schema/resolvers/rooms.spec.ts
@@ -92,6 +92,21 @@ describe('Room', () => {
         })
       })
 
+      describe('user id is self', () => {
+        it('throws error', async () => {
+          await expect(
+            mutate({
+              mutation: createRoomMutation(),
+              variables: {
+                userId: 'chatting-user',
+              },
+            }),
+          ).resolves.toMatchObject({
+            errors: [{ message: 'Cannot create a room with self' }],
+          })
+        })
+      })
+
       describe('user id exists', () => {
         it('returns the id of the room', async () => {
           const result = await mutate({
diff --git a/backend/src/schema/resolvers/rooms.ts b/backend/src/schema/resolvers/rooms.ts
index 02309e172..d5015a03b 100644
--- a/backend/src/schema/resolvers/rooms.ts
+++ b/backend/src/schema/resolvers/rooms.ts
@@ -32,6 +32,9 @@ export default {
       const {
         user: { id: currentUserId },
       } = context
+      if (userId === currentUserId) {
+        throw new Error('Cannot create a room with self')
+      }
       const session = context.driver.session()
       const writeTxResultPromise = session.writeTransaction(async (transaction) => {
         const createRoomCypher = `
diff --git a/webapp/layouts/default.spec.js b/webapp/layouts/default.spec.js
index 1b83491d7..cce8c2eca 100644
--- a/webapp/layouts/default.spec.js
+++ b/webapp/layouts/default.spec.js
@@ -37,7 +37,7 @@ describe('default.vue', () => {
       getters: {
         'auth/isLoggedIn': () => true,
         'chat/showChat': () => {
-          return { showChat: false, roomID: 'u0' }
+          return { showChat: false, roomID: null }
         },
       },
     })
diff --git a/webapp/layouts/default.vue b/webapp/layouts/default.vue
index 8b6b80604..f14c4055f 100644
--- a/webapp/layouts/default.vue
+++ b/webapp/layouts/default.vue
@@ -16,7 +16,7 @@
     <div v-if="$store.getters['chat/showChat'].showChat" class="chat-modul">
       <ds-text align="right" class="close">
         RoomID: {{ $store.getters['chat/showChat'].roomID }}
-        <ds-button @click="$store.commit('chat/SET_OPEN_CHAT', { showChat: false, roomID: 'u0' })">
+        <ds-button @click="$store.commit('chat/SET_OPEN_CHAT', { showChat: false, roomID: null })">
           x
         </ds-button>
       </ds-text>
@@ -41,6 +41,9 @@ export default {
     ChatModule,
   },
   mixins: [seo, mobile()],
+  beforeCreate() {
+    this.$store.commit('chat/SET_OPEN_CHAT', { showChat: false, roomID: null })
+  },
 }
 </script>
 
diff --git a/webapp/store/chat.js b/webapp/store/chat.js
index 2ee8a47ad..be4ddaec0 100644
--- a/webapp/store/chat.js
+++ b/webapp/store/chat.js
@@ -1,14 +1,14 @@
 export const state = () => {
   return {
     showChat: false,
-    roomID: 'u0',
+    roomID: null,
   }
 }
 
 export const mutations = {
   SET_OPEN_CHAT(state, ctx) {
     state.showChat = ctx.showChat || false
-    state.roomID = ctx.roomID || 'u0'
+    state.roomID = ctx.roomID || null
   },
 }