3400584 - HANA Cockpit return an blank screen and cockpit-web-app report error message "TypeError: Cannot read properties of undefined"

SAP HANA Cockpit/Cockpit Manager is showing the blank page after login.

After checking the cockpit-web-app.log/cockpit-admin-web-app.log, you may find below messages: 

MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR   /hana/shared/<SID>/xs/app_working/hdb00-<SID>/executionroot/..../app/node_modules/@sap/site-entry/services/api-proxy.js:31
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR                       "locale": ((req.headers['sap-language']) ? req.headers['sap-language'] + "," : "") +  req.headers['accept-language'],
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR                                              ^
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR   
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR   TypeError: Cannot read properties of undefined (reading 'sap-language')
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR       at ApiProxy.proxy (/hana/shared/<SID>/xs/app_working/hdb00-<SID>/executionroot/..../app/node_modules/@sap/site-entry/services/api-proxy.js:31:44)
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR       at Function.enrichSitePersonalization (/hana/shared/<SID>/xs/app_working/hdb00-<SID>/executionroot/..../app/node_modules/@sap/site-entry/middleware/personalization-middleware.js:38:18)
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR       at /hana/shared/<SID>/xs/app_working/hdb00-<SID>/executionroot/..../app/node_modules/@sap/site-entry/middleware/site-middleware.js:46:55
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR       at runMicrotasks (<anonymous>)
MM/DD/YY h:mm:ss.mss A/PM [APP/36-4] ERR       at processTicksAndRejections (node:internal/process/task_queues:96:5)

or similarly:

MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR   /hana/shared/<SID>/xs/app_working/embedded_execagent/executionroot/..../app/node_modules/@sap/site-entry/services/api-proxy.js:31
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR                       "locale": ((req.headers['sap-language']) ? req.headers['sap-language'] + "," : "") +  req.headers['accept-language'],
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR                                              ^
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR   
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR   TypeError: Cannot read properties of undefined (reading 'sap-language')
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR       at ApiProxy.proxy (/hana/shared/<SID>/xs/app_working/embedded_execagent/executionroot/..../app/node_modules/@sap/site-entry/services/api-proxy.js:31:44)
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR       at Function.enrichSitePersonalization (/hana/shared/<SID>/xs/app_working/embedded_execagent/executionroot/..../app/node_modules/@sap/site-entry/middleware/personalization-middleware.js:38:18)
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR       at /hana/shared/<SID>/xs/app_working/embedded_execagent/executionroot/..../app/node_modules/@sap/site-entry/middleware/site-middleware.js:46:55
MM/DD/YY h:mm:ss.mss  A/PM [APP/11-1] ERR       at processTicksAndRejections (node:internal/process/task_queues:96:5)

SAP HANA Cockpit 2.0

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