diff --git a/modellink/core/datasets/gpt_dataset.py b/modellink/core/datasets/gpt_dataset.py
index fe12a0a8a..4a37d53b2 100644
--- a/modellink/core/datasets/gpt_dataset.py
+++ b/modellink/core/datasets/gpt_dataset.py
@@ -12,6 +12,7 @@ from megatron.core.datasets.utils import log_single_rank
 from megatron.core.datasets.gpt_dataset import (_build_document_index,
                                                 _build_shuffle_index
                                                 )
+from modellink.error_utils import GPTDatasetSampleIndexError
 from .blended_megatron_dataset_builder import need_to_build_dataset
 
 logger = logging.getLogger(__name__)
@@ -153,6 +154,11 @@ def _build_document_sample_shuffle_indices(
             num_epochs,
             num_tokens_per_epoch,
         )
+        
+        if any(sample_index[:, 0] < 0):
+            _url = "https://gitee.com/ascend/ModelLink/wikis/megatron%20data%20helpers%E5%8F%AF%E8%83%BD%E5%BC%95%E5%85%A5%E7%9A%84%E9%97%AE%E9%A2%98"
+            raise GPTDatasetSampleIndexError(f"Bad sample index. Visit {_url} for more information")
+        
         numpy.save(path_to_sample_index, sample_index, allow_pickle=True)
         t_end = time.time()
         log_single_rank(logger, logging.DEBUG, f"\t> time elapsed: {t_end - t_beg:4f} seconds")
@@ -204,6 +210,11 @@ def _build_document_sample_shuffle_indices(
     )
     t_beg = time.time()
     sample_index = numpy.load(path_to_sample_index, allow_pickle=True, mmap_mode='r')
+    
+    if any(sample_index[:, 0] < 0):
+        _url = "https://gitee.com/ascend/ModelLink/wikis/megatron%20data%20helpers%E5%8F%AF%E8%83%BD%E5%BC%95%E5%85%A5%E7%9A%84%E9%97%AE%E9%A2%98"
+        raise GPTDatasetSampleIndexError(f"Bad sample index. Visit {_url} for more information")
+    
     t_end = time.time()
     log_single_rank(logger, logging.DEBUG, f"\t> time elapsed: {t_end - t_beg:4f} seconds")
 
diff --git a/modellink/error_utils.py b/modellink/error_utils.py
index bdf912e0c..88dc32191 100644
--- a/modellink/error_utils.py
+++ b/modellink/error_utils.py
@@ -159,3 +159,15 @@ class IsNotValidError(Exception):
 def ensure_valid(expression, error_message=None):
     if not expression:
         raise IsNotValidError(error_message)
+        
+        
+class GPTDatasetSampleIndexError(Exception):
+    def __init__(self, error_message):
+        super().__init__()
+        self._error_message = error_message
+
+    def __repr__(self):
+        if self._error_message:
+            return self._error_message
+        else:
+            return "Bad sample index."