an urgent question for xiaobaitu and others!!

i am on H-1b visa.

have applied GC. 140 approved, 485 still pending

also am permanent resident of cananda.

holding chinese passport.

i plan to visit cuba, but i will leave for cuba from ottawa(canada) with travel agency,and back to ottawa, then come back to U.S.

i was told it will cause trouble with my immigration status from the International affair office.

should i cancel this trip?