[BUG] Session breaks if image fails to load

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

When I use ShareX to create a screenshot, I sometimes paste to fast before the image has saved to disk, this does display in Claude Code as a broken file, however if I hit enter, the chat from that point keeps receiving error 400 and is permanently broken

What Should Happen?

Shouldn't break the rest of the chat!

Error Messages/Logs

API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.57.content.2.image.source.base64: image cannot be empty"},"request_id":"req_011CZEbiRQPdfpoW75LXvoLq"}

Steps to Reproduce

I guess this can work if you delete a file after the fact but
1) drag file into the desktop before its fully saved to disk, or remove it from storage after dragging it to claude
2) submit the message
3) receive error

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.69

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

<img width="989" height="642" alt="Image" src="https://github.com/user-attachments/assets/75ca9b0c-8e79-4c08-80e7-55a9bc2e7e9b" />