Bruker NMR’s detect the presence of sample by trying to spin it. If the sample cannot spin, then the bsmsdisp panel will show “sample missing”. After you lock the sample, the lock button will not be green even though it actually has been locked and the scanning line has risen to the upper part of the lockdisp window. You can still run your experiment in this situation.
Spinning improves the resolution of your spectrum to some extent. However, the resolution without sample spinning is usable in most applications.
Related link: When it helps to spin and when not.