Providing invalid encrypted key while logging in (but with valid format) causes extension to show "decrypting key..." message indefinitely

[drptbl]

NEX Extension version:
0.1.7
Browser:
Chrome 65.0.3325.146 (64 bit)
Prerequisites:
Valid encrypted key

Reproduction steps:

1. Install Nex extension
2. Accept terms
3. Click on "Login with Key" tab
4. Type invalid encrypted key and any password (I've just incremented one number in valid key, typed "9" instead of "8")

Extension just shows "decrypting key..." message indefinitely. This may confuse future users.

Encrypted keys used in this example:
6PYXccGhNAAjdLaYy8JJtArRTWW81Xb1sah6VeiRj5XwomYU63aQhMfCQQ => valid one
6PYXccGhNAAjdLaYy9JJtArRTWW81Xb1sah6VeiRj5XwomYU63aQhMfCQQ => invalid one

Video: