Kubernetes operator throws NPE when testing with Flink 1.15

2022-04-22 10:19:18,307 o.a.f.k.o.c.FlinkDeploymentController [WARN ][default/flink-example-statemachine] Attempt count: 5, last attempt: true
2022-04-22 10:19:18,329 i.j.o.p.e.ReconciliationDispatcher [ERROR][default/flink-example-statemachine] Error during event processing ExecutionScope{ resource id: CustomResourceID{name='flink-example-statemachine', namespace='default'}, version: 4979543} failed.
org.apache.flink.kubernetes.operator.exception.ReconciliationException: java.lang.NullPointerException
    at org.apache.flink.kubernetes.operator.controller.FlinkDeploymentController.reconcile(FlinkDeploymentController.java:110)
    at org.apache.flink.kubernetes.operator.controller.FlinkDeploymentController.reconcile(FlinkDeploymentController.java:53)
    at io.javaoperatorsdk.operator.processing.Controller$2.execute(Controller.java:101)
    at io.javaoperatorsdk.operator.processing.Controller$2.execute(Controller.java:76)
    at io.javaoperatorsdk.operator.api.monitoring.Metrics.timeControllerExecution(Metrics.java:34)
    at io.javaoperatorsdk.operator.processing.Controller.reconcile(Controller.java:75)
    at io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.reconcileExecution(ReconciliationDispatcher.java:143)
    at io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.handleReconcile(ReconciliationDispatcher.java:109)
    at io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.handleDispatch(ReconciliationDispatcher.java:74)
    at io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.handleExecution(ReconciliationDispatcher.java:50)
    at io.javaoperatorsdk.operator.processing.event.EventProcessor$ControllerExecution.run(EventProcessor.java:349)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at org.apache.flink.kubernetes.operator.utils.FlinkUtils.lambda$deleteJobGraphInKubernetesHA$0(FlinkUtils.java:253)
    at java.base/java.util.ArrayList.forEach(Unknown Source)
    at org.apache.flink.kubernetes.operator.utils.FlinkUtils.deleteJobGraphInKubernetesHA(FlinkUtils.java:248)
    at org.apache.flink.kubernetes.operator.service.FlinkService.submitApplicationCluster(FlinkService.java:130)
    at org.apache.flink.kubernetes.operator.reconciler.deployment.ApplicationReconciler.deployFlinkJob(ApplicationReconciler.java:205)
    at org.apache.flink.kubernetes.operator.reconciler.deployment.ApplicationReconciler.restoreFromLastSavepoint(ApplicationReconciler.java:218)
    at org.apache.flink.kubernetes.operator.reconciler.deployment.ApplicationReconciler.reconcile(ApplicationReconciler.java:117)
    at org.apache.flink.kubernetes.operator.reconciler.deployment.ApplicationReconciler.reconcile(ApplicationReconciler.java:56)
    at org.apache.flink.kubernetes.operator.controller.FlinkDeploymentController.reconcile(FlinkDeploymentController.java:106)
    ... 13 more