Operator crash invalid memory address or nil pointer dereference

Hello,

my operator crashes in a loop with the following error 

 
{"level":"error","ts":1646468748.5747907,"msg":"Observed a panic: \"invalid memory address or nil pointer dereference\" (runtime error: invalid memory address or nil pointer dereference)\ngoroutine 412 [running]:\nk8s.io/apimachinery/pkg/util/runtime.logPanic(0x15d9ee0, 0x22de220)\n\t/home/couchbase/go/pkg/mod/k8s.io/apimachinery@v0.19.4/pkg/util/runtime/runtime.go:74 +0xa6\nk8s.io/apimachinery/pkg/util/runtime.HandleCrash(0x0, 0x0, 0x0)\n\t/home/couchbase/go/pkg/mod/k8s.io/apimachinery@v0.19.4/pkg/util/runtime/runtime.go:48 +0x86\npanic(0x15d9ee0, 0x22de220)\n\t/home/couchbase/jenkins/workspace/couchbase-k8s-microservice-build/golangiJTE7/go1.16.3/src/runtime/panic.go:965 +0x1b9\ngithub.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).reconcileMemberAlternateAddresses(0xc000f14300, 0x0, 0x0)\n\t/home/couchbase/jenkins/workspace/couchbase-k8s-microservice-build/couchbase-operator/pkg/cluster/reconcile.go:1205 +0x6b\ngithub.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).reconcile(0xc000f14300, 0x0, 0x0)\n\t/home/couchbase/jenkins/workspace/couchbase-k8s-microservice-build/couchbase-operator/pkg/cluster/reconcile.go:224 +0x7f7\ngithub.com/couchbase/couchbase-operator/pkg/cluster.(*Cluster).runReconcile(0xc000f14300)\n\t/home/couchbase/jenkins/workspace/couchbase-k8s-microservice-build/couchbase-operator/pkg/cluster/cluster.go:511 +0xdaf\ngithub.com/couchbase/couchbase-operator/pkg/cluster.New(0x7ffcdd53dfe7, 0x3, 0xc000312000, 0xc0004dc180, 0x2, 0x2)\n\t/home/couchbase/jenkins/workspace/couchbase-k8s-microservice-build/couchbase-operator/pkg/cluster/cluster.go:205 +0x7ff\ngithub.com/couchbase/couchbase-operator/pkg/controller.(*CouchbaseClusterReconciler).Reconcile(0xc0003a6e10, 0xc0011fcd10, 0x9, 0xc00016d6f8, 0x12, 0xc000f3a2c0, 0xc000e9a631, 0xc000fa47e8, 0xc000fa47e0)\n\t/home/couchbase/jenkins/workspace/couchbase-k8s-microservice-build/couchbase-operator/pkg/controller/controller.go:7