[ButtonBase] Fix regression in 3.1.2

alexplumb · Oct 17, 2018 · 40c82b8 · 40c82b8
1 parent 11244bf
commit 40c82b8
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/packages/material-ui/src/ButtonBase/ButtonBase.js b/packages/material-ui/src/ButtonBase/ButtonBase.js
@@ -138,7 +138,7 @@ class ButtonBase extends React.Component {
   };
 
   static getDerivedStateFromProps(nextProps, prevState) {
-    if (typeof prevState.focusVisible === 'undefined') {
+    if (!prevState || typeof prevState.focusVisible === 'undefined') {
       return {
         focusVisible: false,
         lastDisabled: nextProps.disabled,