Steps to reproduce the issue

Make sure that plugin Smart Search - Content is enabled.
Install official Polish Language Pack (3.8.7v2) from joomla.org
Create new article or edit existing, write something and click "Save".

Expected result

Saved article without errors.

Actual result

Oryginal error message:
"Error
Save failed with the following error: BŁĄD: kolumna "t" relacji "i5c7v_finder_terms" nie istnieje LINE 2: SET t.links = t.links - 1 ^"
translated:
Error
Save failed with the following error: ERROR: column "t" relation"i5c7v_finder_terms" do not exist LINE 2: SET t.links = t.links - 1 ^

Original log from pgsql:
BŁĄD: kolumna "t" relacji "i5c7v_finder_terms" nie istnieje przy znaku 40
WYRAŻENIE: UPDATE "i5c7v_finder_terms" AS "t"
SET t.links = t.links - 1
FROM "i5c7v_finder_links_terms0" AS "m"
WHERE "m"."link_id" = 7 AND m.term_id = t.term_id
translated:
ERROR: column "t" relation "i5c7v_finder_terms" do not exist near sign 40
STATEMENT: UPDATE "i5c7v_finder_terms" AS "t"
SET t.links = t.links - 1
FROM "i5c7v_finder_links_terms0" AS "m"
WHERE "m"."link_id" = 7 AND m.term_id = t.term_id

System information (as much as possible)

Platform
CentOS 7 + Apache2 + PostgreSQL 9.2 + PHP 5.14.6 + Joomla 3.8.7 (3.8.6 also)

Additional comments

When I disable Smart Search - Content plugin all works fine. Also SQL statement is wrong.