ArticlesPSA Error: "Cannot read properties of undefined (reading 'length')" When Using Work Planner

• The user receives a JavaScript execution error when attempting to load Work Planner: "Cannot read properties of undefined (reading 'length')"

• The error occurs specifically when using the Microsoft Edge browser

• The behavior is localized to a single machine and does not reproduce when the user logs in from a different device

• No relevant errors are captured in the Salesforce Debug Logs, indicating a client-side failure

• Professional Services Cloud
• All versions
• Resource Management 

• Open Microsoft Edge on the affected machine

• Navigate to browser settings and clear hosted app data, cookies, and cache

• Ensure the browser zoom level is set to 100%

• Verify that the Windows display scaling is set to the recommended percentage (typically 100%)

• Reset Edge settings to their original defaults

• If the issue persists, create a new Edge profile or use a Guest profile to isolate potential profile corruption

The issue is caused by a corrupted client-side browser state, such as a damaged cache, local storage conflict, or a corrupt browser profile. This prevents the Work Planner component from correctly processing JavaScript arrays during the initial load.

• For more information on browser requirements, see the Certinia Community documentation

• This error is strictly client-side; no server-side configuration changes or package updates are required to resolve this behavior