diff --git a/tensorflow/lite/kernels/kernel_util.h b/tensorflow/lite/kernels/kernel_util.h
index 6bd6bb1c7ed1141ab50e5ad8e16248366b1ce66f..8fae5740e50209166d42d38f142fba34475480fd 100644
--- a/tensorflow/lite/kernels/kernel_util.h
+++ b/tensorflow/lite/kernels/kernel_util.h
@@ -30,27 +30,49 @@ inline int SizeOfDimension(const TfLiteTensor* t, int dim) {
 }
 inline const TfLiteTensor* GetInput(const TfLiteContext* context,
                                     const TfLiteNode* node, int index) {
-  return &context->tensors[node->inputs->data[index]];
+  const int tensor_index = node->inputs->data[index];
+  if (tensor_index < 0) {
+    return nullptr;
+  }
+  return &context->tensors[tensor_index];
 }
 // Note: You must check if result is not null:
 // TfLiteTensor* my_tensor = GetVariableInput(context, node, kMyTensorIdx);
 // TF_LITE_ENSURE(context, my_tensor != nullptr);
 inline TfLiteTensor* GetVariableInput(TfLiteContext* context,
                                       const TfLiteNode* node, int index) {
-  TfLiteTensor* tensor = &context->tensors[node->inputs->data[index]];
+  const int tensor_index = node->inputs->data[index];
+  if (tensor_index < 0) {
+    return nullptr;
+  }
+  TfLiteTensor* tensor = &context->tensors[tensor_index];
+>>>>>>> d8f8236c29 ([tflite] Test for `kTfLiteOptionalTensor` in `GetInput`.)
   return (tensor->is_variable) ? tensor : nullptr;
 }
 inline TfLiteTensor* GetOutput(TfLiteContext* context, const TfLiteNode* node,
                                int index) {
-  return &context->tensors[node->outputs->data[index]];
+  const int tensor_index = node->outputs->data[index];
+  if (tensor_index < 0) {
+    return nullptr;
+  }
+  return &context->tensors[tensor_index];
 }
 inline TfLiteTensor* GetTemporary(TfLiteContext* context,
                                   const TfLiteNode* node, int index) {
-  return &context->tensors[node->temporaries->data[index]];
+  const int tensor_index = node->temporaries->data[index];
+  if (tensor_index < 0) {
+    return nullptr;
+  }
+  return &context->tensors[tensor_index];
 }
+
 inline const TfLiteTensor* GetIntermediates(TfLiteContext* context,
                                             const TfLiteNode* node, int index) {
-  return &context->tensors[node->intermediates->data[index]];
+  const int tensor_index = node->intermediates->data[index];
+  if (tensor_index < 0) {
+    return nullptr;
+  }
+  return &context->tensors[tensor_index];
 }
 inline int NumInputs(const TfLiteNode* node) { return node->inputs->size; }
 inline int NumOutputs(const TfLiteNode* node) { return node->outputs->size; }