If a project did crash Lazarus while being loaded, then normally Lazarus should ask you the next time, if you want to open the project again.
If you open it again, and it succeeds the warning goes away.
However (IIRC) there are/were a few bugs, were Lazarus did crash at startup, before it could do this check.
Some of them (the ones that are known of) have been fixed in the SVN version.
Also, if the project keeps crashing Lazarus, then you can never open the project again until you know what causes the problem and fix it (best to have a backup).
But if you report a bug, then the crash should get fixed.