Blank Screen in Claude When Invoking MCP Tools

Environment

Platform: Claude Desktop App & Claude.ai website
Operating System: macOS Sequoia (15.5)

Bug Description

When connected to MCP servers, Claude intermittently displays a completely blank screen. This occurs in both the desktop app and on the website, across Chrome and Safari. A refresh restores the UI to its state prior to the tool invocation. The issue appears reproducible with certain tool calls, suggesting it may be related to returning large volumes of data.

Some users on Reddit have [reported](https://www.reddit.com/r/ClaudeAI/comments/1l7fb0t/claude_desktop_blank_window_bug_anyone_else/
) the same blank‐screen issue.

Logs

These are the logs I see on Claude

==> /Users/ashwinraghav/Library/Logs/Claude/window.log <==
2025-06-18 11:48:02 [error] Error: [React Intl] Could not find required `intl` object. <IntlProvider> needs to exist in the component ancestry.
2025-06-18 11:48:02 [error] Uncaught Error: [React Intl] Could not find required `intl` object. <IntlProvider> needs to exist in the component ancestry.
2025-06-18 11:48:02 [error] Potential permissions policy violation: payment is not allowed in this document.

Steps to Reproduce

1. Integrate an MCP tool.
2. Invoke tool calls that return large payloads (exact trigger currently unknown).

Expected Behavior

Claude should continue functioning normally without UI crashes or blank screens.

Actual Behavior

Claude’s interface goes entirely blank after specific tool invocations.

Screenshots

<img width="1909" alt="Image" src="https://github.com/user-attachments/assets/46b1083b-75b6-4446-ad40-b27360df909a" />
<img width="1911" alt="Image" src="https://github.com/user-attachments/assets/b70713c7-b1e1-4a75-b705-035220ff45b2" />