diff --git a/src/tasks/task-registry.maintenance.issue-60299.test.ts b/src/tasks/task-registry.maintenance.issue-60299.test.ts
index b06ab795cc6..bd8e039c732 100644
--- a/src/tasks/task-registry.maintenance.issue-60299.test.ts
+++ b/src/tasks/task-registry.maintenance.issue-60299.test.ts
@@ -152,11 +152,17 @@ function createTaskRegistryMaintenanceHarness(params: {
         status: patch.status,
         endedAt: patch.endedAt,
         lastEventAt: patch.lastEventAt ?? patch.endedAt,
-        ...(patch.error !== undefined ? { error: patch.error } : {}),
         ...(patch.terminalSummary !== undefined
           ? { terminalSummary: patch.terminalSummary ?? undefined }
           : {}),
       } satisfies TaskRecord;
+      if (Object.hasOwn(patch, "error")) {
+        if (patch.error === undefined) {
+          delete next.error;
+        } else {
+          next.error = patch.error;
+        }
+      }
       currentTasks.set(patch.taskId, next);
       return next;
     },
@@ -532,6 +538,134 @@ describe("task-registry maintenance issue #60299", () => {
     expectTaskStatus(currentTasks, task.taskId, "lost");
   });
 
+  it("recovers terminal lost cron tasks from durable run logs", async () => {
+    const startedAt = Date.now() - GRACE_EXPIRED_MS;
+    const task = makeStaleTask({
+      runtime: "cron",
+      sourceId: "cron-job-terminal-lost-ok",
+      runId: `cron:cron-job-terminal-lost-ok:${startedAt}`,
+      status: "lost",
+      error: "backing session missing",
+      startedAt,
+      endedAt: startedAt + 60_000,
+      lastEventAt: startedAt + 60_000,
+      cleanupAfter: Date.now() + 60_000,
+    });
+
+    const { currentTasks } = createTaskRegistryMaintenanceHarness({
+      tasks: [task],
+      cronRunLogEntries: {
+        "cron-job-terminal-lost-ok": [
+          {
+            ts: startedAt + 1250,
+            jobId: "cron-job-terminal-lost-ok",
+            action: "finished",
+            status: "ok",
+            summary: "done",
+            runAtMs: startedAt,
+            durationMs: 1250,
+          },
+        ],
+      },
+    });
+
+    const reconciled = reconcileInspectableTasks();
+    expect(reconciled).toEqual([
+      expect.objectContaining({
+        taskId: task.taskId,
+        status: "succeeded",
+        endedAt: startedAt + 1250,
+        terminalSummary: "done",
+      }),
+    ]);
+    expect(reconciled[0]).not.toHaveProperty("error");
+    expect(previewTaskRegistryMaintenance()).toMatchObject({ reconciled: 0, recovered: 1 });
+    expect(await runTaskRegistryMaintenance()).toMatchObject({ reconciled: 0, recovered: 1 });
+    const recoveredTask = currentTasks.get(task.taskId);
+    expect(recoveredTask).toMatchObject({
+      status: "succeeded",
+      endedAt: startedAt + 1250,
+      terminalSummary: "done",
+    });
+    expect(recoveredTask).not.toHaveProperty("error");
+  });
+
+  it("does not recover terminal lost cron tasks without a backing-session error", async () => {
+    const startedAt = Date.now() - GRACE_EXPIRED_MS;
+    const task = makeStaleTask({
+      runtime: "cron",
+      sourceId: "cron-job-terminal-lost-no-error",
+      runId: `cron:cron-job-terminal-lost-no-error:${startedAt}`,
+      status: "lost",
+      startedAt,
+      endedAt: startedAt + 60_000,
+      lastEventAt: startedAt + 60_000,
+      cleanupAfter: Date.now() + 60_000,
+    });
+
+    const { currentTasks } = createTaskRegistryMaintenanceHarness({
+      tasks: [task],
+      cronRunLogEntries: {
+        "cron-job-terminal-lost-no-error": [
+          {
+            ts: startedAt + 1250,
+            jobId: "cron-job-terminal-lost-no-error",
+            action: "finished",
+            status: "ok",
+            summary: "done",
+            runAtMs: startedAt,
+            durationMs: 1250,
+          },
+        ],
+      },
+    });
+
+    expect(previewTaskRegistryMaintenance()).toMatchObject({ recovered: 0 });
+    expect(await runTaskRegistryMaintenance()).toMatchObject({ recovered: 0 });
+    expect(currentTasks.get(task.taskId)).toMatchObject({
+      status: "lost",
+    });
+  });
+
+  it("does not recover terminal lost cron tasks with non-backing-session errors", async () => {
+    const startedAt = Date.now() - GRACE_EXPIRED_MS;
+    const task = makeStaleTask({
+      runtime: "cron",
+      sourceId: "cron-job-terminal-lost-other-error",
+      runId: `cron:cron-job-terminal-lost-other-error:${startedAt}`,
+      status: "lost",
+      error: "operator marked lost",
+      startedAt,
+      endedAt: startedAt + 60_000,
+      lastEventAt: startedAt + 60_000,
+      cleanupAfter: Date.now() + 60_000,
+    });
+
+    const { currentTasks } = createTaskRegistryMaintenanceHarness({
+      tasks: [task],
+      cronRunLogEntries: {
+        "cron-job-terminal-lost-other-error": [
+          {
+            ts: startedAt + 1250,
+            jobId: "cron-job-terminal-lost-other-error",
+            action: "finished",
+            status: "ok",
+            summary: "done",
+            runAtMs: startedAt,
+            durationMs: 1250,
+          },
+        ],
+      },
+    });
+
+    expect(previewTaskRegistryMaintenance()).toMatchObject({ recovered: 0 });
+    expect(await runTaskRegistryMaintenance()).toMatchObject({ recovered: 0 });
+    expect(currentTasks.get(task.taskId)).toMatchObject({
+      status: "lost",
+      error: "operator marked lost",
+    });
+  });
+
   it("recovers interrupted cron tasks from durable cron job state when run logs are absent", async () => {
     const startedAt = Date.now() - GRACE_EXPIRED_MS;
     const task = makeStaleTask({
diff --git a/src/tasks/task-registry.maintenance.ts b/src/tasks/task-registry.maintenance.ts
index 860483dfdd6..1c77edd31af 100644
--- a/src/tasks/task-registry.maintenance.ts
+++ b/src/tasks/task-registry.maintenance.ts
@@ -357,6 +357,14 @@ function isTimeoutCronError(error: string | undefined): boolean {
   return error === "cron: job execution timed out";
 }
 
+function isRecoverableLostCronTask(task: TaskRecord): boolean {
+  if (task.status !== "lost") {
+    return false;
+  }
+  const error = task.error?.trim().toLowerCase();
+  return Boolean(error?.includes("backing session missing"));
+}
+
 function mapCronTerminalStatus(status: unknown, error?: string): CronTerminalRecovery["status"] {
   if (status === "ok" || status === "skipped") {
     return "succeeded";
@@ -454,7 +462,7 @@ function resolveDurableCronTaskRecovery(
   task: TaskRecord,
   context: CronRecoveryContext,
 ): CronTerminalRecovery | undefined {
-  if (task.runtime !== "cron" || !isActiveTask(task)) {
+  if (task.runtime !== "cron" || (!isActiveTask(task) && !isRecoverableLostCronTask(task))) {
     return undefined;
   }
   const execution = parseCronExecutionId(task);
@@ -808,7 +816,7 @@ function markTaskRecovered(task: TaskRecord, recovery: CronTerminalRecovery): Ta
       status: recovery.status,
       endedAt: recovery.endedAt,
       lastEventAt: recovery.lastEventAt,
-      ...(recovery.error !== undefined ? { error: recovery.error } : {}),
+      error: recovery.error,
       ...(recovery.terminalSummary !== undefined
         ? { terminalSummary: recovery.terminalSummary }
         : {}),
@@ -823,11 +831,14 @@ function projectTaskRecovered(task: TaskRecord, recovery: CronTerminalRecovery):
     status: recovery.status,
     endedAt: recovery.endedAt,
     lastEventAt: recovery.lastEventAt,
-    ...(recovery.error !== undefined ? { error: recovery.error } : {}),
+    error: recovery.error,
     ...(recovery.terminalSummary !== undefined
       ? { terminalSummary: recovery.terminalSummary }
       : {}),
   };
+  if (recovery.error === undefined) {
+    delete projected.error;
+  }
   return {
     ...projected,
     ...(typeof projected.cleanupAfter === "number"
diff --git a/src/tasks/task-registry.test.ts b/src/tasks/task-registry.test.ts
index b2c0d5727d1..5f4b9245c19 100644
--- a/src/tasks/task-registry.test.ts
+++ b/src/tasks/task-registry.test.ts
@@ -616,6 +616,44 @@ describe("task-registry", () => {
     });
   });
 
+  it("clears terminal errors when explicitly updated without an error", async () => {
+    await withTaskRegistryTempDir(async (root) => {
+      process.env.OPENCLAW_STATE_DIR = root;
+      resetTaskRegistryForTests();
+
+      const task = createTaskRecord({
+        runtime: "cron",
+        ownerKey: "system:cron:test",
+        scopeKind: "system",
+        runId: "run-terminal-error-clear",
+        task: "Recover cron task",
+        status: "running",
+        deliveryStatus: "not_applicable",
+        startedAt: 100,
+      });
+
+      markTaskTerminalById({
+        taskId: task.taskId,
+        status: "failed",
+        endedAt: 200,
+        error: "backing session missing",
+      });
+      markTaskTerminalById({
+        taskId: task.taskId,
+        status: "succeeded",
+        endedAt: 250,
+        error: undefined,
+      });
+
+      const recoveredTask = getTaskById(task.taskId);
+      expect(recoveredTask).toMatchObject({
+        status: "succeeded",
+        endedAt: 250,
+      });
+      expect(recoveredTask).not.toHaveProperty("error");
+    });
+  });
+
   it("keeps stronger run-scoped terminal states when a late success arrives", async () => {
     await withTaskRegistryTempDir(async () => {
       resetTaskRegistryMemoryForTest();
diff --git a/src/tasks/task-registry.ts b/src/tasks/task-registry.ts
index 4e1fa27909b..1db89b54838 100644
--- a/src/tasks/task-registry.ts
+++ b/src/tasks/task-registry.ts
@@ -1180,6 +1180,9 @@ function updateTask(taskId: string, patch: Partial<TaskRecord>): TaskRecord | nu
     return null;
   }
   const next = normalizeTaskTimestamps({ ...current, ...patch });
+  if (Object.hasOwn(patch, "error") && patch.error === undefined) {
+    delete next.error;
+  }
   if (isTerminalTaskStatus(next.status) && typeof next.cleanupAfter !== "number") {
     next.cleanupAfter = resolveTaskCleanupAfter({
       ...next,
@@ -1553,11 +1556,10 @@ export function markTaskTerminalById(params: {
   terminalOutcome?: TaskTerminalOutcome | null;
 }): TaskRecord | null {
   ensureTaskRegistryReady();
-  return updateTask(params.taskId, {
+  const patch: Partial<TaskRecord> = {
     status: params.status,
     endedAt: params.endedAt,
     lastEventAt: params.lastEventAt ?? params.endedAt,
-    ...(params.error !== undefined ? { error: params.error } : {}),
     ...(params.terminalSummary !== undefined
       ? { terminalSummary: normalizeTaskSummary(params.terminalSummary) }
       : {}),
@@ -1569,7 +1571,11 @@ export function markTaskTerminalById(params: {
           }),
         }
       : {}),
-  });
+  };
+  if (Object.hasOwn(params, "error")) {
+    patch.error = params.error;
+  }
+  return updateTask(params.taskId, patch);
 }
 
 export function markTaskLostById(params: {