diff --git a/x-pack/plugins/ml/public/alerting/anomaly_detection_rule/config_validator.tsx b/x-pack/plugins/ml/public/alerting/anomaly_detection_rule/config_validator.tsx
index 88b1502ac3b99..04e96546196bb 100644
--- a/x-pack/plugins/ml/public/alerting/anomaly_detection_rule/config_validator.tsx
+++ b/x-pack/plugins/ml/public/alerting/anomaly_detection_rule/config_validator.tsx
@@ -32,13 +32,15 @@ export const ConfigValidator: FC<ConfigValidatorProps> = React.memo(
   ({ jobConfigs = [], alertInterval, alertParams, alertNotifyWhen, maxNumberOfBuckets }) => {
     if (jobConfigs.length === 0) return null;
 
-    const alertIntervalInSeconds = parseInterval(alertInterval)!.asSeconds();
+    const alertIntervalInSeconds = parseInterval(alertInterval)?.asSeconds();
 
     const lookbackIntervalInSeconds =
       !!alertParams.lookbackInterval && parseInterval(alertParams.lookbackInterval)?.asSeconds();
 
     const isAlertIntervalTooHigh =
-      lookbackIntervalInSeconds && lookbackIntervalInSeconds < alertIntervalInSeconds;
+      lookbackIntervalInSeconds &&
+      alertIntervalInSeconds &&
+      lookbackIntervalInSeconds < alertIntervalInSeconds;
 
     const jobWithoutStartedDatafeed = jobConfigs
       .filter((job) => job.datafeed_config.state !== DATAFEED_STATE.STARTED)
@@ -49,6 +51,7 @@ export const ConfigValidator: FC<ConfigValidatorProps> = React.memo(
     const notifyWhenWarning =
       alertNotifyWhen === 'onActiveAlert' &&
       lookbackIntervalInSeconds &&
+      alertIntervalInSeconds &&
       alertIntervalInSeconds < lookbackIntervalInSeconds;
 
     const bucketSpanDuration = parseInterval(jobConfigs[0].analysis_config.bucket_span!);