Occasional panic in game

[nighca]

https://goplus-builder.qiniu.io/project/nighca/zombie-with-panic

启动后正常玩一段时间后，会随机出现“panic: JavaScript error: memory access out of bounds”或“panic: JavaScript error: null function or function signature mismatch”

版本 2.0.0-pre.24 & 2.0.0-pre.31 均能复现