diff --git a/dist/src/taskState.js b/dist/src/taskState.js
index 904e7f4..0506021 100644
--- a/dist/src/taskState.js
+++ b/dist/src/taskState.js
@@ -77,6 +77,10 @@ export async function upsertXWorkmateSessionMapping(api, input) {
     let mapping;
     await patchSessionEntry({
         sessionKey: input.openclawSessionKey,
+        fallbackEntry: {
+            sessionId: input.openclawSessionKey,
+            updatedAt: Date.now(),
+        },
         preserveActivity: true,
         update: (entry) => {
             const existing = readMappingFromEntry(entry);
diff --git a/src/taskState.test.ts b/src/taskState.test.ts
index 31e0e4b..c202c23 100644
--- a/src/taskState.test.ts
+++ b/src/taskState.test.ts
@@ -25,12 +25,17 @@ function createApiFixture(tasks: Record<string, unknown> = {}) {
             })),
           patchSessionEntry: async ({
             sessionKey,
+            fallbackEntry,
             update,
           }: {
             sessionKey: string;
+            fallbackEntry?: any;
             update: (entry: any) => Partial<any> | null;
           }) => {
-            const current = sessions.get(sessionKey) ?? { sessionId: sessionKey, updatedAt: 0 };
+            const current = sessions.get(sessionKey) ?? fallbackEntry;
+            if (!current) {
+              return null;
+            }
             const patch = update(current);
             if (patch) {
               sessions.set(sessionKey, { ...current, ...patch });
diff --git a/src/taskState.ts b/src/taskState.ts
index 2e7011b..88b4c6c 100644
--- a/src/taskState.ts
+++ b/src/taskState.ts
@@ -49,6 +49,7 @@ type SessionEntry = Record<string, unknown> & {
 
 type PatchSessionEntry = (params: {
   sessionKey: string;
+  fallbackEntry?: SessionEntry;
   preserveActivity?: boolean;
   update: (entry: SessionEntry) => Partial<SessionEntry> | null;
 }) => Promise<SessionEntry | null> | SessionEntry | null;
@@ -159,6 +160,10 @@ export async function upsertXWorkmateSessionMapping(
   let mapping: XWorkmateSessionMappingV1 | undefined;
   await patchSessionEntry({
     sessionKey: input.openclawSessionKey,
+    fallbackEntry: {
+      sessionId: input.openclawSessionKey,
+      updatedAt: Date.now(),
+    },
     preserveActivity: true,
     update: (entry) => {
       const existing = readMappingFromEntry(entry);