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@@ -3230,7 +3230,8 @@ function migrateSwitch($fromVersion, $manager, $processFiles = true)
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error_log('End - Fix post_group_id');
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// Delete c_student_publication from any session that doesn't exist anymore
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- $sql = "DELETE FROM c_student_publication WHERE session_id NOT IN (SELECT id FROM session)";
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+ $sql = "DELETE FROM c_student_publication
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+ WHERE session_id NOT IN (SELECT id FROM session) AND (session_id <> 0 or session_id is not null)";
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$connection->executeQuery($sql);
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error_log('Fix work documents');
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