twig-form generates error in console

[lpatiny]

On the following test view

http://127.0.0.1:5500/src/index.html?config=../testcase/config/default.json&viewURL=../testcase/data/twig-form/view.json&dataURL=../testcase/data/twig-form/data.json

If you click on the button of the template on the right you have an error:

• Warning: a promise was created in a handler at /127.0.0.1:5500/src/modules/types/display/template-twig/view.js:198:18 but was not returned from it, see http://goo.gl/rRqMUw

If you click twice on send data you have an error:
bluebird.core.js:1417 Unhandled rejection Error: latency at Variable.triggerChange (http://127.0.0.1:5500/src/src/main/variables.js:156:35)

I spend a while but could not find the reason for this. @targos please could you help me on this.

[targos]

It means you have to go from top to bottom of the printed stack trace and make sure that the Promise created at the first line is either handled (with await or .catch) or returned to the caller (which can then also either handle it or return it, etc...)