Handle unscheduled browsing simulation ticks

src/services/account-browsing-simulation.ts

@@ -74,7 +74,9 @@ export class AccountBrowsingSimulationService {
       this.options.repository.setNextDueAt(this.options.accountId, nextDueAt, now);
       return { kind: 'scheduled', nextDueAt };
     }
-    if (!force && now < settings.nextDueAt) return { kind: 'idle', reason: 'Browsing simulation is not due' };
+    if (!force && settings.nextDueAt !== null && now < settings.nextDueAt) {
+      return { kind: 'idle', reason: 'Browsing simulation is not due' };
+    }
     if (!force && isQuietTime(new Date(now), settings)) {
       const nextDueAt = moveOutsideQuietHours(now, settings);
       this.options.repository.setNextDueAt(this.options.accountId, nextDueAt, now);