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[Accordion] Fix AccordionSummary false-positive propType warning with disableGeneration #27385

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Original file line number Diff line number Diff line change
Expand Up @@ -144,7 +144,9 @@ AccordionSummary.propTypes = {
* See [CSS API](#css) below for more details.
*/
classes: chainPropTypes(PropTypes.object, (props) => {
if (props.classes.focused.indexOf(' ') !== -1) {
// Guard against when generation of classes is disabled in the stylesheets (`disableGeneration`).
// For `disableGeneration` we don't have an accurate warning but `disableGeneration` is an advanced use case anyway.
if (props.classes.focused !== undefined && props.classes.focused.indexOf(' ') !== -1) {
return new Error(
[
'Material-UI: The `classes.focused` key is deprecated.',
Expand Down