Camera flash not turning off

Question

So I'm working on an Activity where you're supposed to take a picture and then uploading it to a Parse server.

Everything is working fine except for the flash mode; turning it on works but turning it off doesn't work.

This is my code for turning the flash on:

private void turnOnFlash() {
    Camera.Parameters params = camera.getParameters();
    if (!isFlashOn) {
        if (camera == null || params == null) {
            return;
        }
        params.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
        camera.setParameters(params);
        isFlashOn = true;

        // Show the flash mode in a Toast.
        Toast.makeText(this, "Flash mode: " + camera.getParameters().getFlashMode(), Toast.LENGTH_SHORT).show();

        // Changing button image.
        imgFlash.setImageResource(R.drawable.ic_flash_on_white_48dp);
    }
}

This is my code for turning the flash off:

private void turnOffFlash() {
    Camera.Parameters params = camera.getParameters();
    if (isFlashOn) {
        if (camera == null || params == null) {
            return;
        }
        params.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
        camera.setParameters(params);
        isFlashOn = false;

        // Show the flash mode in a Toast.
        Toast.makeText(this, "Flash mode: " + camera.getParameters().getFlashMode(), Toast.LENGTH_SHORT).show();

        // Changing button image.
        imgFlash.setImageResource(R.drawable.ic_flash_off_white_48dp);
    }
}

Any help would be appreciated.

EDIT

The Toast that shows the flash mode shows Flash mode: off when the turnOffFlash() method is called, but the flash remains on.