On OSGi Framework Configuration page, there should be some warning, when you try to set the framework start level lower than 80.

Current behaviour:
There is no warning message, that some bundles have start level 80. Fuse will crash, when you set the start level to lower value.

Expected behaviour:
We would expect some warning message, when you want to set this value to lower than 80. It will be more user-friendly and it will prevent lot of misunderstanding.