Steps to reproduce:
1) Open any project.
2) Set the bundle ID to something without dots or a single dot.
3) Press build.

An exception is logged towards the end of the build:
ArgumentOutOfRangeException: Cannot be negative.
Parameter name: length

The build fails because dots are missing from the bundle ID. Dots are used to separate company name and product name from the ID. The build either shouldn't fail or shouldn't be allowed in the first place.

Reproduced on:
2018.3.0a2, 5.5.0a6

Did not reproduce:
5.5.0a5