processing_qwen2_vl IndexError: index 0 is out of bounds for dimension 0 with size 0

[susht3]

when i use grpo to train qwen2.5 vl model, i got thie error：
[rank3]: Traceback (most recent call last):
[rank3]: File "/mnt/afs/VLM-R1/src/open-r1-multimodal/src/open_r1/grpo_rdbp.py", line 514, in
[rank3]: main(script_args, training_args, model_args)
[rank3]: File "/mnt/afs/VLM-R1/src/open-r1-multimodal/src/open_r1/grpo_rdbp.py", line 503, in main
[rank3]: trainer.train()
[rank3]: File "/mnt/afs/conda/vlm-r1/lib/python3.10/site-packages/transformers/trainer.py", line 2241, in train
[rank3]: return inner_training_loop(
[rank3]: File "/mnt/afs/conda/vlm-r1/lib/python3.10/site-packages/transformers/trainer.py", line 2548, in _inner_training_loop
[rank3]: tr_loss_step = self.training_step(model, inputs, num_items_in_batch)
[rank3]: File "/mnt/afs/conda/vlm-r1/lib/python3.10/site-packages/transformers/trainer.py", line 3698, in training_step
[rank3]: loss = self.compute_loss(model, inputs, num_items_in_batch=num_items_in_batch)
[rank3]: File "/mnt/afs/mllm/VLM-R1/src/open-r1-multimodal/src/open_r1/trainer/grpo_trainer.py", line 433, in compute_loss
[rank3]: prompt_inputs = self.processing_class(
[rank3]: File "/mnt/afs/conda/vlm-r1/lib/python3.10/site-packages/transformers/models/qwen2_vl/processing_qwen2_vl.py", line 139, in call
[rank3]: self.image_token, "<|placeholder|>" * (image_grid_thw[index].prod() // merge_length), 1
[rank3]: IndexError: index 0 is out of bounds for dimension 0 with size 0

[LIRENDA621]

same error, How to fix it?