Gorse version
0.4.16

Describe the bug
{"level":"info","ts":1744420962.448361,"msg":"ranking recommendation","n_complete_users":8,"n_working_users":3096,"throughput":8}
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x60 pc=0xc34201]

goroutine 74 [running]:
github.com/zhenghaoz/gorse/model/click.(*FM).Predict(0xc00073e360, {0xc001efe658?, 0xc0000a7200?}, {0xc004d67348, 0x3}, {0xc00073f680, 0x9, 0x0?}, {0xc002761860, 0xc, ...})
/go/gorse/model/click/model.go:204 +0x61
github.com/zhenghaoz/gorse/worker.(*Worker).replacement(0xc00074c580, 0xc00495fde8?, 0xc004960958, {0xc004d742c0, 0x8, 0x142?}, 0xc0015c06f0)
/go/gorse/worker/worker.go:1236 +0x8fc
github.com/zhenghaoz/gorse/worker.(*Worker).Recommend.func2(0xa0?, 0xd)
/go/gorse/worker/worker.go:778 +0x352f
github.com/zhenghaoz/gorse/base/parallel.Parallel(0xc18, 0xc0059c4740?, 0xc0001e79a0)
/go/gorse/base/parallel/parallel.go:39 +0xf7
github.com/zhenghaoz/gorse/worker.(*Worker).Recommend(0xc00074c580, {0xc00208e000, 0xc18, 0xf99})
/go/gorse/worker/worker.go:546 +0x1074
github.com/zhenghaoz/gorse/worker.(*Worker).Serve.func1()
/go/gorse/worker/worker.go:405 +0x425
github.com/zhenghaoz/gorse/worker.(*Worker).Serve(0xc00074c580)
/go/gorse/worker/worker.go:417 +0xdbf
main.glob..func1.1()
/go/gorse/cmd/gorse-in-one/main.go:109 +0x3f
created by main.glob..func1
/go/gorse/cmd/gorse-in-one/main.go:107 +0x9f1

To Reproduce
更新用户信息