Checklist

• 1. I have searched related issues but cannot get the expected help.
• 2. The bug has not been fixed in the latest version.
• 3. Please note that if the bug-related issue you submitted lacks corresponding environment info and a minimal reproducible demo, it will be challenging for us to reproduce and resolve the issue, reducing the likelihood of receiving feedback.
• 4. If the issue you raised is not a bug but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
• 5. Please use English, otherwise it will be closed.

Describe the bug

Currently, LoRA in SGLang cannot handle none lora_path properly.

Reproduction

Some cases below will have issues.

1. First batch input lora_path as [a, a]. Second batch input lora_path as [None, None]. The second batch will be processed as if you had input lora_path as [a, a].
2. If you input lora_path as [a, None], the output of the second prompt will be almost empty.

Environment

Main branch