karaoke-rs: Panic when occasionally loading a web player song

Load up web player, play some songs, eventually what seems to be a random song will not load and when I check the console, the following appears. Reloading the web player page with F5 will make it play, however.

1.karaoke-rs.js:1 panicked at 'called `Option::unwrap()` on a `None` value', src/libcore/option.rs:378:21

Stack:

Error
    at Module.N (http://localhost:6484/1.karaoke-rs.js:1:11733)
    at __wbg_new_59cb74e423758ede (http://localhost:6484/karaoke-rs.js:1:1020)
    at wasm-function[434]:0x7a0c0
    at wasm-function[1499]:0xab4a6
    at wasm-function[777]:0x9aee7
    at wasm-function[1045]:0xa61bb
    at wasm-function[1232]:0xa9cf3
    at wasm-function[1200]:0xa969b
    at wasm-function[153]:0x1b7b7
    at wasm-function[153]:0x1b322


I @ 1.karaoke-rs.js:1
wasm://wasm/wasm-0060a61e:778 Uncaught RuntimeError: unreachable
    at wasm-function[777]:0x9af1d
    at wasm-function[1045]:0xa61bb
    at wasm-function[1232]:0xa9cf3
    at wasm-function[1200]:0xa969b
    at wasm-function[153]:0x1b7b7
    at wasm-function[153]:0x1b322
    at wasm-function[201]:0x3e7aa
    at wasm-function[523]:0x854f4
    at wasm-function[681]:0x942d4
    at wasm-function[522]:0x8532d