Error saving term lineage

When activating the option "Save term lineage " in hierarchical select configuration page, drupal returns the following error:

PDOException: SQLSTATE[22018]: [Microsoft][ODBC Driver 11 for SQL Server][SQL Server]Conversion failed when converting the varchar value 'label_1' to data type int.: SELECT t.[tid] AS [tid] FROM taxonomy_term_data t INNER JOIN taxonomy_term_hierarchy h ON h.tid = t.tid WHERE ( ([h].[parent] = :db_condition_placeholder_0) AND ([t].[vid] = :db_condition_placeholder_1) ) ORDER BY t.weight ASC, t.name ASC; Array ( [:db_condition_placeholder_0] => label_1 [:db_condition_placeholder_1] => 14 ) in taxonomy_get_children() (line 1087 of ..\modules\taxonomy\taxonomy.module).

As an addition to the above, by the time the module throws the following error, fails to save nodes, terms etc.

In order to fix the above issue, we go to hierarchical_select.module file and in line 986 we replace:

$hs_selection[] = $value; with $hs_selection[] = (int)$value;.

Clear the cache and everything works fine.