[BUG] API Error: 400 messages: text content blocks must be non-empty

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?

I keep getting this error now for last two sessions. I tried logging out, clear memory etc with no avail.

API Error
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.120.content.1.text: cache_control cannot be set for empty text blocks"},"request_id":"req_011CakA42sRuCfEnvT2wUMVq"}

API Error
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages: text content blocks must be non-empty"},"request_id":"req_011CakAExpA6ZJErbrJqbtXm"}

What Should Happen?

While requesting follow up actions.

Error Messages/Logs

API Error
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages.120.content.1.text: cache_control cannot be set for empty text blocks"},"request_id":"req_011CakA42sRuCfEnvT2wUMVq"}
?

API Error
API Error: 400 {"type":"error","error":{"type":"invalid_request_error","message":"messages: text content blocks must be non-empty"},"request_id":"req_011CakAExpA6ZJErbrJqbtXm"}

Steps to Reproduce

create a session.
Continue working on claude code. While submitting new request I am getting these errors.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.0.73+

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_