In the situation of / at the point of
Describes the context or situation in which something occurs, often used in reports or formal statements.
Examples
話し合っているところを邪魔してしまった。
I interrupted them while they were having a discussion.
休憩しているところを呼ばれた。
I was called while I was taking a break.
処理中のところを突然エラーが出た。
An error occurred suddenly while I was processing it.
Quick check
I interrupted them while they were having a discussion. 話し合っている___邪魔してしまった。