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🚨 [Sentry] TypeError: Cannot read properties of null (reading 'name') in about.html #4

@CasJam

Description

@CasJam

🔥 Error Report from Sentry

Issue ID: TESTHTML-2G
First Seen: January 15, 2025, 3:42 PM UTC
Last Seen: January 15, 2025, 3:43 PM UTC
Frequency: 3 events in 1 minute
Users Affected: 2


📋 Error Details

Error Type: TypeError
Error Message: Cannot read properties of null (reading 'name')

Stack Trace:

TypeError: Cannot read properties of null (reading 'name')
    at about.html:92:37
    at about.html:90:9

🌐 Environment Information

Field Value
Environment Production
URL https://casjam.github.io/testhtml/about.html
Browser Chrome 131.0.0.0
OS macOS 14.5.0
User Agent Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36
Release e89e397fb2c8a4f9d12e3f45a6b7c8d9e0f1a2b3

🔍 Code Context

File: about.html (Line 94-96)

// Bug: Trying to access undefined property
const userProfile = null;
const displayName = userProfile.name.toUpperCase(); // This will throw TypeError

📊 Event Details

Event #1:

  • Timestamp: 2025-01-15T15:42:31.123Z
  • User ID: anonymous_user_1
  • Session ID: sess_8f7e6d5c4b3a2918
  • IP Address: 192.168.1.105

Event #2:

  • Timestamp: 2025-01-15T15:42:45.456Z
  • User ID: anonymous_user_2
  • Session ID: sess_7d6c5b4a3928e817
  • IP Address: 10.0.0.24

Event #3:

  • Timestamp: 2025-01-15T15:43:12.789Z
  • User ID: anonymous_user_1
  • Session ID: sess_8f7e6d5c4b3a2918
  • IP Address: 192.168.1.105

🏷️ Tags

  • level:error
  • environment:production
  • browser:chrome
  • platform:javascript
  • handled:false
  • mechanism:onerror

💡 Suggested Fix

The error occurs because the code attempts to access the name property on a null object. Consider adding null checking:

// Suggested fix:
const userProfile = null;
const displayName = userProfile?.name?.toUpperCase() || 'Guest User';

🚀 Impact Assessment

  • Severity: High
  • Error Rate: 100% of page loads affected
  • Performance Impact: JavaScript execution halted
  • User Experience: About page functionality compromised

📝 Additional Context

This error was introduced in commit e89e397 with the message "Add user profile display functionality". The error prevents the about page from completing its JavaScript initialization sequence.

Potential Root Cause: Missing null validation when accessing user profile data.


This issue was automatically created by Sentry error monitoring. View in Sentry Dashboard →

Priority: 🔴 Critical - Affects core page functionality
Assignment: Needs immediate attention from development team

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