diff --git a/src/store/index.tsx b/src/store/index.tsx
index fb49732d..d9e89bf8 100644
--- a/src/store/index.tsx
+++ b/src/store/index.tsx
@@ -16,6 +16,7 @@ import { chatHistoryStore } from './chat';
 
   function hydrateAll() {
     Promise.all([hydrate('main', mainStore), hydrate('ui', uiStore)]).then(() => {
+      mainStore.initializeSessionId();
       uiStore.setReady(true);
     });
   }
diff --git a/src/store/main.ts b/src/store/main.ts
index f7f6b9d1..f73884da 100644
--- a/src/store/main.ts
+++ b/src/store/main.ts
@@ -2093,6 +2093,25 @@ export class MainStore {
     }
   }
 
+  @observable
+  sessionId = '';
+
+  @action setSessionId(id: string) {
+    this.sessionId = id;
+  }
+
+  initializeSessionId() {
+    let sessionId = sessionStorage.getItem('sphinx_session_id');
+
+    if (!sessionId) {
+      sessionId = randomString(32);
+      sessionStorage.setItem('sphinx_session_id', sessionId);
+    }
+
+    this.setSessionId(sessionId);
+    return sessionId;
+  }
+
   @persist('object')
   @observable
   keysendInvoice = '';