harbor: login panic when using elastic cache instead of internal redis

Expected behavior and actual behavior:

Sometimes, I use admin user login, the core service panic. (I set auth mode to ldap) Login success after I try several times.

Versions:

• harbor version: [1.9.2]
• docker engine version: [18.09.3]
• docker-compose version: [z.z.z]

In kubernetes.

Additional context:

core service log:

2019-11-12T08:17:29Z [DEBUG] [/core/filter/security.go:227]: OIDC CLI modifier only handles request by docker CLI or helm CLI
2019-11-12T08:17:29Z [DEBUG] [/core/filter/security.go:442]: can not get user information from session
2019-11-12T08:17:29Z [DEBUG] [/core/filter/security.go:497]: user information is nil
2019-11-12T08:17:29Z [DEBUG] [/core/filter/security.go:511]: using local database project manager
2019-11-12T08:17:29Z [DEBUG] [/core/filter/security.go:513]: creating local database security context...
2019-11-12T08:17:29Z [DEBUG] [/common/dao/user.go:277]: Check if user admin is super user
2019-11-12T08:17:29Z [DEBUG] [/core/auth/authenticator.go:139]: Current AUTH_MODE is db_auth
2019/11/12 08:17:29 [C] [panic.go:522] the request url is  /c/login
2019/11/12 08:17:29 [C] [panic.go:522] Handler crashed with error runtime error: invalid memory address or nil pointer dereference
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/runtime/panic.go:522
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/runtime/panic.go:82
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/runtime/signal_unix.go:390
2019/11/12 08:17:29 [C] [panic.go:522] /harbor/src/vendor/github.com/astaxie/beego/controller.go:579
2019/11/12 08:17:29 [C] [panic.go:522] /harbor/src/core/api/base.go:180
2019/11/12 08:17:29 [C] [panic.go:522] /harbor/src/core/controllers/base.go:117
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/reflect/value.go:447
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/reflect/value.go:308
2019/11/12 08:17:29 [C] [panic.go:522] /harbor/src/vendor/github.com/astaxie/beego/router.go:815
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/net/http/server.go:2774
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/net/http/server.go:1878
2019/11/12 08:17:29 [C] [panic.go:522] /usr/local/go/src/runtime/asm_amd64.s:1337
2019-11-12T08:17:30Z [DEBUG] [/core/filter/security.go:227]: OIDC CLI modifier only handles request by docker CLI or helm CLI
2019-11-12T08:17:30Z [DEBUG] [/core/filter/security.go:442]: can not get user information from session
2019-11-12T08:17:30Z [DEBUG] [/core/filter/security.go:497]: user information is nil
2019-11-12T08:17:30Z [DEBUG] [/core/filter/security.go:511]: using local database project manager
2019-11-12T08:17:30Z [DEBUG] [/core/filter/security.go:513]: creating local database security context...
2019-11-12T08:17:30Z [DEBUG] [/common/dao/user.go:277]: Check if user admin is super user
2019-11-12T08:17:30Z [DEBUG] [/core/auth/authenticator.go:139]: Current AUTH_MODE is db_auth
2019/11/12 08:17:30 [C] [panic.go:522] the request url is  /c/login
2019/11/12 08:17:30 [C] [panic.go:522] Handler crashed with error runtime error: invalid memory address or nil pointer dereference
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/runtime/panic.go:522
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/runtime/panic.go:82
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/runtime/signal_unix.go:390
2019/11/12 08:17:30 [C] [panic.go:522] /harbor/src/vendor/github.com/astaxie/beego/controller.go:579
2019/11/12 08:17:30 [C] [panic.go:522] /harbor/src/core/api/base.go:180
2019/11/12 08:17:30 [C] [panic.go:522] /harbor/src/core/controllers/base.go:117
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/reflect/value.go:447
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/reflect/value.go:308
2019/11/12 08:17:30 [C] [panic.go:522] /harbor/src/vendor/github.com/astaxie/beego/router.go:815
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/net/http/server.go:2774
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/net/http/server.go:1878
2019/11/12 08:17:30 [C] [panic.go:522] /usr/local/go/src/runtime/asm_amd64.s:1337
2019-11-12T08:17:31Z [DEBUG] [/core/filter/security.go:227]: OIDC CLI modifier only handles request by docker CLI or helm CLI
2019-11-12T08:17:31Z [DEBUG] [/core/filter/security.go:442]: can not get user information from session
2019-11-12T08:17:31Z [DEBUG] [/core/filter/security.go:497]: user information is nil
2019-11-12T08:17:31Z [DEBUG] [/core/filter/security.go:511]: using local database project manager
2019-11-12T08:17:31Z [DEBUG] [/core/filter/security.go:513]: creating local database security context...
2019-11-12T08:17:31Z [DEBUG] [/common/dao/user.go:277]: Check if user admin is super user
2019-11-12T08:17:31Z [DEBUG] [/core/auth/authenticator.go:139]: Current AUTH_MODE is db_auth
2019/11/12 08:17:31 [D] [server.go:2774] | 192.168.216.79| 200 |  16.839992ms|   match| POST     /c/login   r:/c/login