Reset corrupted measure (one instrument)

There should be a way to set an individual voice (in an individual measure) when that measure becomes corrupted, i.e. the measure shows an incorrect (or totally absent) number of beats. When I have these measures it it difficult and sometimes impossible to set them to the appropriate number of beats. Trying to do the reset will usually disturb the sequence of notes in the following measure and in the case when a corrupted measure is totally devoid of beats (no notes no rests) most attempts to fiix this result in MuseScore crashing. This corruption happens to me regularly when scanning in choral scores for setting up MuseScrore access for members who are not yet adept music readers to learn/practice their individual parts (n.b. all members possess purchased copies of the actual sheet music and scores are marked private to avoid copyright infringement and ensure that artists/companies are properly paid for their work)
Forgive me if this is already in there somewhere but I've spent some considerable time looking and cannot find this.