It stopped MW because of file absence. So I took file from old version to solve the problem
Topic on Extension talk:AddThis
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Reply to "Latest release (for MW 1.34) does not contain AddThis.php"
Latest release (for MW 1.34) does not contain AddThis.php
For me that was AddThis.pup from MW 1.30, because from 1.33 it did not replace default icons but add custom to them only.