Taraaweeh prayer is not obligatory, and the ruling on breaking fast with followers of bid’ah

What is the ruling on a person who does not prayTaraaweeh at all
during the month of Ramadaan with no valid excuse? Is there any sin on
him because of that?
I work for the Aramco company and sometimes my work requires me to
stay until after Maghrib, so I have to break my fastat work. I am just
about the only Sunni Muslim there, the rest are Shi'ah and Isma'ilis.
Is it permissible for me to break my fast with them?.
Praise be to Allaah.
If a Muslim does not pray Taraaweeh, there is no sinon him for that,
whether he has an excuse or not, because it is not obligatory. Rather
it is a confirmed Sunnah which the Prophet (peace and blessings of
Allaah be upon him) did regularly and encouraged the Muslims to do as
he said: "Whoever prays qiyaam in Ramadaan out of faith and in the
hope of reward, his previous sins will be forgiven." Narrated by
al-Bukhaari, 37; Muslim, 760.
But the Muslim should notneglect Taraaweeh prayer. If he cannot pray
it with the imam in the mosque, then he should pray it at home. If he
cannot pray eleven rak'ahs then he should pray as much as he can, even
if it is only two rak'ahs, then he should pray Witr.
And Allaah knows best.
With regard to breaking your fast with the Shi'ah and Isma'ilis, if
you think that breaking your fast with them will serve the purpose of
softening theirhearts and calling them tofollow the Sunnah and give up
the innovations that they are following, then this is something that
is prescribed in Islam.
But if you think that your breaking your fast with them will not serve
any purpose, then it is better not to break your fast with them, and
to avoid them, so as to denounce the innovations that they are
following and lest they confuse you with their specious arguments when
you do not have enough knowledge to realize that what they aresaying
is false, thus exposing yourself to fitnah (temptation, tribulation).
And Allaah knows best.