model fit failed at inference_train_function - tensorflow

Question

I faced some issue on the model fit and new to Tensorflow.
Model: "sequential"
_________________________________________________________________
Layer (type) Output Shape Param #
=================================================================
embedding (Embedding) (None, 50, 5) 30
lstm (LSTM) (None, 64) 17920
dense (Dense) (None, 6) 390
=================================================================
Total params: 18,340
Trainable params: 18,340
Non-trainable params: 0
_________________________________________________________________
When it reached the model.fit, somehow it pop up these sorts of error messages. The purpose of this training is on the text analysis on the git log and categorised it whether it belongs to either new feature, fix and many more.
Traceback (most recent call last):
File "test.py", line 138, in <module>
model_training()
File "test.py", line 136, in model_training
model.fit( training_padding_sentence, training_general_label, epochs = 20)
File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 67, in error_handler
raise e.with_traceback(filtered_tb) from None
File "/usr/local/lib/python3.8/dist-packages/tensorflow/python/eager/execute.py", line 54, in quick_execute
tensors = pywrap_tfe.TFE_Py_Execute(ctx._handle, device_name, op_name,
tensorflow.python.framework.errors_impl.InvalidArgumentError: Graph execution error:
Detected at node 'sequential/embedding/embedding_lookup' defined at (most recent call last):
File "test.py", line 138, in <module>
model_training()
File "test.py", line 136, in model_training
model.fit( training_padding_sentence, training_general_label, epochs = 20)
File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 64, in error_handler
return fn(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/training.py", line 1384, in fit
tmp_logs = self.train_function(iterator)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/training.py", line 1021, in train_function
return step_function(self, iterator)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/training.py", line 1010, in step_function
outputs = model.distribute_strategy.run(run_step, args=(data,))
File "/usr/local/lib/python3.8/dist-packages/keras/engine/training.py", line 1000, in run_step
outputs = model.train_step(data)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/training.py", line 859, in train_step
y_pred = self(x, training=True)
File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 64, in error_handler
return fn(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/base_layer.py", line 1096, in __call__
outputs = call_fn(inputs, *args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 92, in error_handler
return fn(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/sequential.py", line 374, in call
return super(Sequential, self).call(inputs, training=training, mask=mask)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/functional.py", line 451, in call
return self._run_internal_graph(
File "/usr/local/lib/python3.8/dist-packages/keras/engine/functional.py", line 589, in _run_internal_graph
outputs = node.layer(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 64, in error_handler
return fn(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/engine/base_layer.py", line 1096, in __call__
outputs = call_fn(inputs, *args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/utils/traceback_utils.py", line 92, in error_handler
return fn(*args, **kwargs)
File "/usr/local/lib/python3.8/dist-packages/keras/layers/embeddings.py", line 197, in call
out = tf.nn.embedding_lookup(self.embeddings, inputs)
Node: 'sequential/embedding/embedding_lookup'
indices[0,0] = 15 is not in [0, 6)
[[{{node sequential/embedding/embedding_lookup}}]] [Op:__inference_train_function_3232]