@pitaj here is the nodebb-log. Actually nodebb crashes after submitting the register form.
17/10 20:53:30 [11178] - error:  TypeError: Cannot read property 'username' of undefined
    at /home/user/nodebb/NodeBB/node_modules/nodebb-plugin-registration-notification/library.js:78:52
    at /home/user/nodebb/NodeBB/node_modules/async/dist/async.js:3861:9
    at /home/user/nodebb/NodeBB/node_modules/async/dist/async.js:421:16
    at iterateeCallback (/home/user/nodebb/NodeBB/node_modules/async/dist/async.js:928:24)
    at /home/user/nodebb/NodeBB/node_modules/async/dist/async.js:906:16
    at /home/user/nodebb/NodeBB/node_modules/async/dist/async.js:3858:13
    at /home/user/nodebb/NodeBB/src/database/mongo/sorted.js:64:5
    at handleCallback (/home/user/nodebb/NodeBB/node_modules/mongodb/lib/utils.js:120:56)
    at /home/user/nodebb/NodeBB/node_modules/mongodb/lib/cursor.js:860:16
    at handleCallback (/home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:171:5)
    at setCursorDeadAndNotified (/home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:505:3)
    at nextFunction (/home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:651:7)
    at Cursor.next [as _next] (/home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:692:3)
    at fetchDocs (/home/user/nodebb/NodeBB/node_modules/mongodb/lib/cursor.js:856:10)
    at /home/user/nodebb/NodeBB/node_modules/mongodb/lib/cursor.js:879:7
    at handleCallback (/home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:171:5)
    at nextFunction (/home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:682:5)
    at /home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:593:7
    at queryCallback (/home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/cursor.js:253:5)
    at /home/user/nodebb/NodeBB/node_modules/mongodb-core/lib/connection/pool.js:469:18
    at _combinedTickCallback (internal/process/next_tick.js:95:7)
    at process._tickCallback (internal/process/next_tick.js:161:9)
17/10 20:53:30 [11178] - info: [app] Shutdown (SIGTERM/SIGINT) Initialised.
17/10 20:53:30 [11178] - info: [app] Database connection closed.
17/10 20:53:30 [11178] - info: [app] Web server closed to connections.
17/10 20:53:30 [11178] - info: [app] Shutdown complete.
17/10 20:53:37 [8701] - info: Initializing NodeBB v1.6.1 http://my.domain.de
17/10 20:54:03 [8701] - info: [socket.io] Restricting access to origin: http://my.domain.de:*
17/10 20:54:07 [8701] - info: Routes added
17/10 20:54:07 [8701] - info: NodeBB Ready
17/10 20:54:07 [8701] - info: Enabling 'trust proxy'
17/10 20:54:07 [8701] - info: NodeBB is now listening on: 0.0.0.0:63536
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