for the following snippet of code, ts complains that “object is possibly null” with a red underline just below “rawMQTTTopicsResults[topic].timestamp < staleTimestamp.toString()”

for (const topic of Object.keys(rawMQTTTopicsResults)) {
    let stale: boolean = true
    if (rawMQTTTopicsResults[topic] && rawMQTTTopicsResults[topic].timestamp !== null){
      stale = rawMQTTTopicsResults[topic].timestamp < staleTimestamp.toString()
    }
    resultsWithStale[topic] = {
      ...rawMQTTTopicsResults[topic],
      stale: stale
    };
  }

and here is the type for “rawMQTTTopicsResults”

const rawMQTTTopicsResults: Record<string, {
    timestamp: string | null;
    value: string | number | boolean | null;
}>

it is worth noting that my vs-code compiler does not indicate this error, it only appears when building.