No sounds when I unplugged my bluetooth earphones

I don't know why my Samsung C9 pro starts to malfunction whenever I listen to music nor watch a video without using my earphones,there's no sound coming out from my phone speaker.But when I use my earphones,it works.I don't know how to fix it.

from Android Forums at AndroidCentral.com - Ask a Question https://ift.tt/2C02xUJ
via IFTTT