Crash in code explorer

Opening the attachment in https://wasdk.github.io/wasmcodeexplorer/ leads to
```
wasm-001d726e-116:1 Uncaught (in promise) RuntimeError: memory access out of bounds
    at wasm-function[116]:0x18b05
    at eval (https://wasdk.github.io/wasmcodeexplorer/source-map-utils.js:387:5)
```
[b.wasm.zip](https://github.com/wasdk/wasdk/files/3975962/b.wasm.zip)
