Internal server error while updating profile without image

I'm getting an internal server error while updating the user profile. It's updated when I update with a new avatar but get an error while updating without avatar

Backend Code

exports.updateProfile = catchAsyncErrors(async (req, res, next) => {

    const newUserData = {
        name: req.body.name,
        email: req.body.email,
    };

    // clodunary
    if (req.body.avatar !== "") {
        const user = await User.findById(req.user.id);
    
        const imageId = user.avatar.public_id;
    
        await cloudinary.v2.uploader.destroy(imageId);
    
        const myCloud = await cloudinary.v2.uploader.upload(req.body.avatar, {
          folder: "avatars",
          width: 150,
          crop: "scale",
        });
    
        newUserData.avatar = {
          public_id: myCloud.public_id,
          url: myCloud.secure_url,
        };
      }
    const user = await User.findByIdAndUpdate(req.user.id, newUserData, {
        new: true,
        runValidators: true,
        useFindAndModify: false
    })

    res.status(200).json({
        success: true
    })
});