Docker run fails

[ivyleavedtoadflax]

When running docker run I get the following on an ubuntu 18.04 system.

$ sudo docker run -p 8080:8080 adtac/relevant-xkcd:latest   
open comics.bin: no such file or directory
Started background crawl
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x689a2e]

goroutine 5 [running]:
main.crawl()
        /go/src/relevant-xkcd/crawler.go:22 +0xfe
main.main.func1()
        /go/src/relevant-xkcd/main.go:16 +0x22
created by main.main
        /go/src/relevant-xkcd/main.go:20 +0x3e