Chrome Version       : 64.0.3254.0 
URLs (if applicable) : http://demo.tombo.io/
Other browsers tested:
	Chrome (62.0.3202.75): OK
	Safari (11.0.1): OK
	Safari Technology Preview (Rel.42): FAIL with another exception
	Firefox (56.0.2): OK
	Firefox Nightly (58.0a1): OK
	
What steps will reproduce the problem?
(1) Push play button on center.

What is the expected result?
Game launches without exceptions.
cf. http://demo.tombo.io/launch-image/launch-image-320x480.png

What happens instead?
Unexpected exception is thrown.

Please provide any additional information below. Attach a screenshot if
possible.
- Only wasm version causes the exception.
- Built with patched emscripten, for mainly Objective-C support.
- Using dynamic link feature of emscripten (loading two .wasm files)
- Unfortunately, I couldn't make a small application which causes similar exception.
- https://twitter.com/tzik_tack/status/925601290888941568