Did you have the Mac go into Sleep mode (manual or automatically) while OpenLP was running? I have found that from time to time if OpenLP is running, Mac goes into sleep, comes out and then I quit OpenLP that causes it to crash.
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Shutdown OpenLP; restart your Mac; launch OpenLP and then close it straight after. If OpenLP closes normally you should be OK. If still has errors you could remove & reinstall OpenLP.
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If none of that helps then it may be that one of your SQLite database files is corrupt / being opened by another process (app). OpenLP definitely will not like that. I know because I use SQLPro for SQLite to run queries and reports of the OpenLP song database — and I found out the hard way.