cluster-etcd-operator panic in CI

I0409 09:52:54.280834       1 builder.go:299] openshift-cluster-etcd-operator version v0.0.0-alpha.0-1430-g3d5483e-3d5483e1
...
E0409 10:08:08.921203       1 runtime.go:79] Observed a panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)
goroutine 1581 [running]:
k8s.io/apimachinery/pkg/util/runtime.logPanic({0x28cd3c0?, 0x4b191e0})
	k8s.io/apimachinery@v0.29.0/pkg/util/runtime/runtime.go:75 +0x85
k8s.io/apimachinery/pkg/util/runtime.HandleCrash({0xc0016eccd0, 0x1, 0x27036c0?})
	k8s.io/apimachinery@v0.29.0/pkg/util/runtime/runtime.go:49 +0x6b
panic({0x28cd3c0?, 0x4b191e0?})
	runtime/panic.go:914 +0x21f
github.com/openshift/cluster-etcd-operator/pkg/operator/etcdcertsigner.addCertSecretToMap(0x0?, 0x0)
	github.com/openshift/cluster-etcd-operator/pkg/operator/etcdcertsigner/etcdcertsignercontroller.go:341 +0x27
github.com/openshift/cluster-etcd-operator/pkg/operator/etcdcertsigner.(*EtcdCertSignerController).syncAllMasterCertificates(0xc000521ea0, {0x32731e8, 0xc0006fd1d0}, {0x3280cb0, 0xc000194ee0})
	github.com/openshift/cluster-etcd-operator/pkg/operator/etcdcertsigner/etcdcertsignercontroller.go:252 +0xa65
...