TensorFlow.NET: NullReferenceException thrown in Tensorflow.Binding.dll when trying to run EfficientDetD0

Description

 public class tfDetEngine : DetectionEngine
    {
        private readonly Session _session;

        public tfDetEngine(string modelPath, string labelPath) : base(modelPath, labelPath)
        {
            _session = Session.LoadFromSavedModel(modelPath);
        }

        public override IEnumerable<Detection> Detect(Tensor image)
        {

            using (_session)
            {
                try
                {
                    var tensors = _session?.eval(image);
                    if (tensors != null)
                    {
                        var boxesP = tensors["detection_boxes"].ToArray<float>();

                        var boxes = new float[boxesP.Length / 4][];
                        for (int i = 0; i < boxesP.Length; i += 4)
                        {
                            boxes[i / 4] = new float[] { boxesP[i], boxesP[i + 1], boxesP[i + 2], boxesP[i + 3] };
                        }

                        var scores = tensors["detection_scores"].ToArray<float>();
                        var classes = tensors["detection_classes"].ToArray<float>();

                        var detectedObjects = boxes.Select((box, i) => new Detection
                        {
                            Box = box,
                            Score = scores[i],
                            Class = classes[i]
                        });

                        return detectedObjects;
                    }

                    return new List<Detection>();
                }

                catch (NullReferenceException e)
                {
                    return new List<Detection>();
                }
            }
        }

I keep getting NullReferenceException thrown in Tensorflow.Binding.dll whenever I try to evaluate the model with a (512, 512, 3) sized image tensor