SQL syntax, missing single quotes around the delta

blockcache_alter.module (line 420, function _blockcache_alter_get_cache_id)
$block->cache = db_result(db_query("SELECT cache FROM {blocks} WHERE module = '%s' AND delta = %d AND theme = '%s'", $module, $delta, $theme));
changed to
$block->cache = db_result(db_query("SELECT cache FROM {blocks} WHERE module = '%s' AND delta = '%d' AND theme = '%s'", $module, $delta, $theme));

Views uses delta's of view-name-block_1, another-view-block_2, etc. Needed the single quotes for the SQL to work correctly.