Recovered from panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)

Issue

• Master URL not accessible.
• Atomic-openshift-master-api logs reports below errors :

Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: E0627 23:41:04.489211   74645 runtime.go:58] Recovered from panic: "invalid memory address or nil pointer dereference" (runtime error: invalid memory address or nil pointer dereference)
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /builddir/build/BUILD/atomic-openshift-git-0.9fe156c/_thirdpartyhacks/src/k8s.io/kubernetes/pkg/util/runtime/runtime.go:52
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /builddir/build/BUILD/atomic-openshift-git-0.9fe156c/_thirdpartyhacks/src/k8s.io/kubernetes/pkg/util/runtime/runtime.go:40
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /usr/lib/golang/src/runtime/asm_amd64.s:402
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /usr/lib/golang/src/runtime/panic.go:387
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /usr/lib/golang/src/runtime/panic.go:42
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /usr/lib/golang/src/runtime/sigpanic_unix.go:26
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /builddir/build/BUILD/atomic-openshift-git-0.9fe156c/_build/src/github.com/openshift/origin/pkg/image/registry/imagestreamimport/rest.go:181
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /builddir/build/BUILD/atomic-openshift-git-0.9fe156c/_thirdpartyhacks/src/k8s.io/kubernetes/pkg/apiserver/resthandler.go:437
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /builddir/build/BUILD/atomic-openshift-git-0.9fe156c/_thirdpartyhacks/src/k8s.io/kubernetes/pkg/apiserver/resthandler.go:400
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /builddir/build/BUILD/atomic-openshift-git-0.9fe156c/_thirdpartyhacks/src/k8s.io/kubernetes/pkg/apiserver/resthandler.go:916
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: /usr/lib/golang/src/runtime/asm_amd64.s:2232
Jun 27 23:41:04 master.example.com atomic-openshift-master-api[74645]: I0627 23:41:04.489317   74645 trace.go:57] Trace "Create /oapi/v1/namespaces/rseibe1-free/imagestreamimports" (started 2017-06-27 23:41:03.451174599 -0500 CDT):