が あったら

if there is; if there was

→ が
phrase Rare #31,766
if there is; if there was Used to introduce a condition involving something existing or being available. The space is not normally written between が and あったら.
JA: 何かまずいことが あったら、すぐ知らせて。
EN: If anything goes wrong, let me know right away.

何かまずいことがあったら?

What if something goes wrong?

— 預言者 (2009)

もし私の来ない夜があったら――どうする?

What would you do if there were a night when I didn't come?

— イングリッシュ・ペイシェント (1996)

店にタクシー無線があったら―無線で注文を受けられるよ

If the store had a taxi radio, it could take orders over the radio.

— es[エス] (2001)

お手伝いさんたちも何か心当たりがあったら遠慮なくおっしゃって下さい

If any of the staff have any idea what might have happened, please don’t hesitate to speak up.

— High and Low (1963)

もしこの世界より完璧な現実があったら?

What if there were a reality more perfect than this world?

— Good Luck, Have Fun, Don't Die (2026)