diff --git a/packages/x-date-pickers/src/AdapterLuxon/AdapterLuxon.ts b/packages/x-date-pickers/src/AdapterLuxon/AdapterLuxon.ts
index 04dad1132b217..abebdc22bb3ad 100644
--- a/packages/x-date-pickers/src/AdapterLuxon/AdapterLuxon.ts
+++ b/packages/x-date-pickers/src/AdapterLuxon/AdapterLuxon.ts
@@ -246,7 +246,7 @@ export class AdapterLuxon implements MuiPickersAdapter<string> {
   };
 
   public isValid = (value: DateTime | null): value is DateTime => {
-    if (value === null) {
+    if (value == null) {
       return false;
     }