This issue is also reproducible in the examples provided in the docs.
https://material-table.com/#/docs/features/editable
Expand - Editable Example - Click on plus icon and try adding value to the input fields.
Same, started to experience that few minutes ago after working with an already working table in production for a while...
+1 same issue.
+1
+1
Same Issue :(

+1
+1 Same issue. And appears in documentation too.

Duplicate of #2269.
Same Issue here aswell
I am also facing same issue.
+1 this is an issue
+1
+1 specific to 1.68.0, switching to 1.67.1 solves it unless you need the bulk update feature.
EDIT It works now 馃憤 (2020-09-24)
@mbrn I'm not sure if there has been a regression but the error is occurring in the demo when trying to edit any column.
https://material-table.com/#/docs/features/editable

TypeError: e.props.onBulkEditRowChanged is not a function
at a.<anonymous> (m-table-edit-row.js:218)
at no (react-dom.production.min.js:193)
at ao (react-dom.production.min.js:193)
at Ho (react-dom.production.min.js:216)
at qo (react-dom.production.min.js:220)
at react-dom.production.min.js:250
at Object.t.unstable_runWithPriority (scheduler.production.min.js:18)
at Ad (react-dom.production.min.js:250)
at Dd (react-dom.production.min.js:249)
at Nd (react-dom.production.min.js:248)
Most helpful comment
Duplicate of #2269.