diff --git a/CHANGELOG.md b/CHANGELOG.md
index 76ced29da0f..b95d8a0c2eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1035,6 +1035,7 @@ Docs: https://docs.openclaw.ai
 - Feishu: detect bot mentions in post messages with embedded docs when `message.mentions` is empty. (#18074) Thanks @popomore.
 - Agents/Sessions: align session lock watchdog hold windows with run and compaction timeout budgets (plus grace), preventing valid long-running turns from being force-unlocked mid-run while still recovering hung lock owners. (#18060)
 - Cron: preserve default model fallbacks for cron agent runs when only `model.primary` is overridden, so failover still follows configured fallbacks unless explicitly cleared with `fallbacks: []`. (#18210) Thanks @mahsumaktas.
+- Cron/Isolation: treat non-finite `nextRunAtMs` as missing and repair isolated `every` anchor fallback so legacy jobs without valid timestamps self-heal and scheduler wake timing remains valid. (#19469) Thanks @guirguispierre.
 - Cron: route text-only announce output through the main session announce flow via runSubagentAnnounceFlow so cron text-only output remains visible to the initiating session. Thanks @tyler6204.
 - Cron: treat `timeoutSeconds: 0` as no-timeout (not clamped to 1), ensuring long-running cron runs are not prematurely terminated. Thanks @tyler6204.
 - Cron announce injection now targets the session determined by delivery config (`to` + channel) instead of defaulting to the current session. Thanks @tyler6204.
diff --git a/src/cron/service.issue-regressions.test.ts b/src/cron/service.issue-regressions.test.ts
index 469ff498019..88eef2c9bdb 100644
--- a/src/cron/service.issue-regressions.test.ts
+++ b/src/cron/service.issue-regressions.test.ts
@@ -241,6 +241,55 @@ describe("Cron issue regressions", () => {
     cron.stop();
   });
 
+  it("repairs isolated every jobs missing createdAtMs and sets nextWakeAtMs", async () => {
+    const store = await makeStorePath();
+    await fs.writeFile(
+      store.storePath,
+      JSON.stringify({
+        version: 1,
+        jobs: [
+          {
+            id: "legacy-isolated",
+            agentId: "feature-dev_planner",
+            sessionKey: "agent:main:main",
+            name: "legacy isolated",
+            enabled: true,
+            schedule: { kind: "every", everyMs: 300_000 },
+            sessionTarget: "isolated",
+            wakeMode: "now",
+            payload: { kind: "agentTurn", message: "poll workflow queue" },
+            state: {},
+          },
+        ],
+      }),
+    );
+
+    const cron = new CronService({
+      cronEnabled: true,
+      storePath: store.storePath,
+      log: noopLogger,
+      enqueueSystemEvent: vi.fn(),
+      requestHeartbeatNow: vi.fn(),
+      runIsolatedAgentJob: vi.fn().mockResolvedValue({ status: "ok", summary: "ok" }),
+    });
+    await cron.start();
+
+    const status = await cron.status();
+    const jobs = await cron.list({ includeDisabled: true });
+    const isolated = jobs.find((job) => job.id === "legacy-isolated");
+    expect(Number.isFinite(isolated?.state.nextRunAtMs)).toBe(true);
+    expect(Number.isFinite(status.nextWakeAtMs)).toBe(true);
+
+    const persisted = JSON.parse(await fs.readFile(store.storePath, "utf8")) as {
+      jobs: Array<{ id: string; state?: { nextRunAtMs?: number | null } }>;
+    };
+    const persistedIsolated = persisted.jobs.find((job) => job.id === "legacy-isolated");
+    expect(typeof persistedIsolated?.state?.nextRunAtMs).toBe("number");
+    expect(Number.isFinite(persistedIsolated?.state?.nextRunAtMs)).toBe(true);
+
+    cron.stop();
+  });
+
   it("repairs missing nextRunAtMs on non-schedule updates without touching other jobs", async () => {
     const store = await makeStorePath();
     const cron = await startCronForStore({ storePath: store.storePath });
diff --git a/src/cron/service/jobs.ts b/src/cron/service/jobs.ts
index db42b80ba54..488683bed96 100644
--- a/src/cron/service/jobs.ts
+++ b/src/cron/service/jobs.ts
@@ -63,15 +63,22 @@ function computeStaggeredCronNextRunAtMs(job: CronJob, nowMs: number) {
   return undefined;
 }
 
+function isFiniteTimestamp(value: unknown): value is number {
+  return typeof value === "number" && Number.isFinite(value);
+}
+
 function resolveEveryAnchorMs(params: {
   schedule: { everyMs: number; anchorMs?: number };
   fallbackAnchorMs: number;
 }) {
   const raw = params.schedule.anchorMs;
-  if (typeof raw === "number" && Number.isFinite(raw)) {
+  if (isFiniteTimestamp(raw)) {
     return Math.max(0, Math.floor(raw));
   }
-  return Math.max(0, Math.floor(params.fallbackAnchorMs));
+  if (isFiniteTimestamp(params.fallbackAnchorMs)) {
+    return Math.max(0, Math.floor(params.fallbackAnchorMs));
+  }
+  return 0;
 }
 
 export function assertSupportedJobSpec(job: Pick<CronJob, "sessionTarget" | "payload">) {
@@ -144,11 +151,13 @@ export function computeJobNextRunAtMs(job: CronJob, nowMs: number): number | und
         return nextFromLastRun;
       }
     }
+    const fallbackAnchorMs = isFiniteTimestamp(job.createdAtMs) ? job.createdAtMs : nowMs;
     const anchorMs = resolveEveryAnchorMs({
       schedule: job.schedule,
-      fallbackAnchorMs: job.createdAtMs,
+      fallbackAnchorMs,
     });
-    return computeNextRunAtMs({ ...job.schedule, everyMs, anchorMs }, nowMs);
+    const next = computeNextRunAtMs({ ...job.schedule, everyMs, anchorMs }, nowMs);
+    return isFiniteTimestamp(next) ? next : undefined;
   }
   if (job.schedule.kind === "at") {
     // One-shot jobs stay due until they successfully finish.
@@ -167,14 +176,14 @@ export function computeJobNextRunAtMs(job: CronJob, nowMs: number): number | und
           : typeof schedule.at === "string"
             ? parseAbsoluteTimeMs(schedule.at)
             : null;
-    return atMs !== null ? atMs : undefined;
+    return atMs !== null && Number.isFinite(atMs) ? atMs : undefined;
   }
   const next = computeStaggeredCronNextRunAtMs(job, nowMs);
   if (next === undefined && job.schedule.kind === "cron") {
     const nextSecondMs = Math.floor(nowMs / 1000) * 1000 + 1000;
     return computeStaggeredCronNextRunAtMs(job, nextSecondMs);
   }
-  return next;
+  return isFiniteTimestamp(next) ? next : undefined;
 }
 
 /** Maximum consecutive schedule errors before auto-disabling a job. */
@@ -233,6 +242,11 @@ function normalizeJobTickState(params: { state: CronServiceState; job: CronJob;
     return { changed, skip: true };
   }
 
+  if (!isFiniteTimestamp(job.state.nextRunAtMs) && job.state.nextRunAtMs !== undefined) {
+    job.state.nextRunAtMs = undefined;
+    changed = true;
+  }
+
   const runningAt = job.state.runningAtMs;
   if (typeof runningAt === "number" && nowMs - runningAt > STUCK_RUN_MS) {
     state.deps.log.warn(
@@ -298,7 +312,7 @@ export function recomputeNextRuns(state: CronServiceState): boolean {
     // Preserving a still-future nextRunAtMs avoids accidentally advancing
     // a job that hasn't fired yet (e.g. during restart recovery).
     const nextRun = job.state.nextRunAtMs;
-    const isDueOrMissing = nextRun === undefined || now >= nextRun;
+    const isDueOrMissing = !isFiniteTimestamp(nextRun) || now >= nextRun;
     if (isDueOrMissing) {
       if (recomputeJobNextRunAtMs({ state, job, nowMs: now })) {
         changed = true;
@@ -321,7 +335,7 @@ export function recomputeNextRunsForMaintenance(state: CronServiceState): boolea
     // Only compute missing nextRunAtMs, do NOT recompute existing ones.
     // If a job was past-due but not found by findDueJobs, recomputing would
     // cause it to be silently skipped.
-    if (job.state.nextRunAtMs === undefined) {
+    if (!isFiniteTimestamp(job.state.nextRunAtMs)) {
       if (recomputeJobNextRunAtMs({ state, job, nowMs: now })) {
         changed = true;
       }
@@ -332,14 +346,18 @@ export function recomputeNextRunsForMaintenance(state: CronServiceState): boolea
 
 export function nextWakeAtMs(state: CronServiceState) {
   const jobs = state.store?.jobs ?? [];
-  const enabled = jobs.filter((j) => j.enabled && typeof j.state.nextRunAtMs === "number");
+  const enabled = jobs.filter((j) => j.enabled && isFiniteTimestamp(j.state.nextRunAtMs));
   if (enabled.length === 0) {
     return undefined;
   }
-  return enabled.reduce(
-    (min, j) => Math.min(min, j.state.nextRunAtMs as number),
-    enabled[0].state.nextRunAtMs as number,
-  );
+  const first = enabled[0]?.state.nextRunAtMs;
+  if (!isFiniteTimestamp(first)) {
+    return undefined;
+  }
+  return enabled.reduce((min, j) => {
+    const next = j.state.nextRunAtMs;
+    return isFiniteTimestamp(next) ? Math.min(min, next) : min;
+  }, first);
 }
 
 export function createJob(state: CronServiceState, input: CronJobCreate): CronJob {
diff --git a/src/cron/service/timer.ts b/src/cron/service/timer.ts
index 8267d4c970a..85c392584fd 100644
--- a/src/cron/service/timer.ts
+++ b/src/cron/service/timer.ts
@@ -250,8 +250,12 @@ export function armTimer(state: CronServiceState) {
     const jobCount = state.store?.jobs.length ?? 0;
     const enabledCount = state.store?.jobs.filter((j) => j.enabled).length ?? 0;
     const withNextRun =
-      state.store?.jobs.filter((j) => j.enabled && typeof j.state.nextRunAtMs === "number")
-        .length ?? 0;
+      state.store?.jobs.filter(
+        (j) =>
+          j.enabled &&
+          typeof j.state.nextRunAtMs === "number" &&
+          Number.isFinite(j.state.nextRunAtMs),
+      ).length ?? 0;
     state.deps.log.debug(
       { jobCount, enabledCount, withNextRun },
       "cron: armTimer skipped - no jobs with nextRunAtMs",
@@ -476,7 +480,7 @@ function isRunnableJob(params: {
     return false;
   }
   const next = job.state.nextRunAtMs;
-  return typeof next === "number" && nowMs >= next;
+  return typeof next === "number" && Number.isFinite(next) && nowMs >= next;
 }
 
 function collectRunnableJobs(