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Now friends .. I think I got it right.. Have looked at all post in table EWRmedio_media again - there was nothing wrong with user_id (have looked after NULL/empty info), seing with my eyes. But I found a lot af entries of youtube videos with should have been deleted because user is deleted, the category including entries is deleted...

I manually removed these 36 records of youtube videos and BINGO - the Re-build Search Index runs smooth..

So maybe some check in code somewhere is necessary? ..