Client tried to link to internal page and got a WPOD.

Here's the full error report:
An unexpected error occurred.
mysql error: [145: Table './seattler_src/PageSearchIndex' is marked as crashed and should be repaired] in EXECUTE("select p1.cID, pt.ctHandle from Pages p1 left join Pages p2 on (p1.cPointerID = p2.cID) left join PageTypes pt on (pt.ctID = (if (p2.cID is null, p1.ctID, p2.ctID))) left join PagePaths on (PagePaths.cID = p1.cID and PagePaths.ppIsCanonical = 1) left join PageSearchIndex psi on (psi.cID = if(p2.cID is null, p1.cID, p2.cID)) inner join CollectionVersions cv on (cv.cID = if(p2.cID is null, p1.cID, p2.cID) and cvID = (select max(cvID) from CollectionVersions where cID = cv.cID)) inner join Collections c on (c.cID = if(p2.cID is null, p1.cID, p2.cID)) left join CollectionSearchIndexAttributes on (CollectionSearchIndexAttributes.cID = if (p2.cID is null, p1.cID, p2.cID)) where 1=1 and p1.cParentID = '0' and (p1.cIsTemplate = 0 or p2.cIsTemplate = 0) and (p1.cID not in (5,6,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,43,44,45,46,47,48,49,50,51,52,53,54,55,85,86,87,88,89,90,91,92,180) or p2.cID not in (5,6,7,8,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,43,44,45,46,47,48,49,50,51,52,53,54,55,85,86,87,88,89,90,91,92,180)) ")

Has anyone ever seen this? What should I do?

Also, I'm a complete virgin when it comes to direct editing of MYSQL, should I be nervous?

Thanks!