The monthly Attendance Sheet stopped working all of a sudden and I can’t seem to trace what really triggered this weird behavior. Anyone with clues or few pointers kindly assist.
This is how noisy my console is 
query_report.js:848 Uncaught TypeError: Cannot read property ‘datamanager’ of null
at frappe.views.QueryReport.get_visible_columns (query_report.js:848)
at HTMLAnchorElement.action (query_report.js:1150)
at HTMLAnchorElement.dispatch (jquery.min.js:3)
at HTMLAnchorElement.r.handle (jquery.min.js:3)
query_report.js:848 Uncaught TypeError: Cannot read property ‘datamanager’ of null
at frappe.views.QueryReport.get_visible_columns (query_report.js:848)
at HTMLAnchorElement.action (query_report.js:1136)
at HTMLAnchorElement.dispatch (jquery.min.js:3)
at HTMLAnchorElement.r.handle (jquery.min.js:3)