diff --git a/packages/babel-parser/src/tokenizer/index.js b/packages/babel-parser/src/tokenizer/index.js
index ba544a9fb7..40b5e661c1 100644
--- a/packages/babel-parser/src/tokenizer/index.js
+++ b/packages/babel-parser/src/tokenizer/index.js
@@ -233,8 +233,9 @@ export default class Tokenizer extends LocationParser {
       return;
     }
 
-    if (curContext.override) {
-      curContext.override(this);
+    const override = curContext?.override;
+    if (override) {
+      override(this);
     } else {
       this.getTokenFromCode(this.input.codePointAt(this.state.pos));
     }
diff --git a/packages/babel-parser/test/fixtures/es2020/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/input.js b/packages/babel-parser/test/fixtures/es2020/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/input.js
new file mode 100644
index 0000000000..5428e236f7
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2020/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/input.js
@@ -0,0 +1,4 @@
+foo?.class.bar
+foo?.function.bar
+foo?.bar?.class.bar
+foo?.function?.bar
diff --git a/packages/babel-parser/test/fixtures/es2020/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/output.json b/packages/babel-parser/test/fixtures/es2020/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/output.json
new file mode 100644
index 0000000000..9f59d5d3c2
--- /dev/null
+++ b/packages/babel-parser/test/fixtures/es2020/optional-chaining/chaining-off-optionally-chained-keys-named-class-or-function/output.json
@@ -0,0 +1,469 @@
+{
+  "type": "File",
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+  "end": 71,
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+                },
+                "end": {
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+                  "column": 3
+                },
+                "identifierName": "foo"
+              },
+              "name": "foo"
+            },
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+              "end": 10,
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 10
+                },
+                "identifierName": "class"
+              },
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+            },
+            "computed": false,
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+              },
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+              "identifierName": "bar"
+            },
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+          },
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+        }
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+                },
+                "identifierName": "foo"
+              },
+              "name": "foo"
+            },
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+              "start": 20,
+              "end": 28,
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 5
+                },
+                "end": {
+                  "line": 2,
+                  "column": 13
+                },
+                "identifierName": "function"
+              },
+              "name": "function"
+            },
+            "computed": false,
+            "optional": true
+          },
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+            "end": 32,
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+              "identifierName": "bar"
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+            "name": "bar"
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+        "end": 52,
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+            "end": 48,
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+              },
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+                }
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+                "start": 33,
+                "end": 36,
+                "loc": {
+                  "start": {
+                    "line": 3,
+                    "column": 0
+                  },
+                  "end": {
+                    "line": 3,
+                    "column": 3
+                  },
+                  "identifierName": "foo"
+                },
+                "name": "foo"
+              },
+              "property": {
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+                "end": 41,
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+            },
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+            "optional": true
+          },
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+            "end": 52,
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+              },
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+          },
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+        }
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+              },
+              "name": "foo"
+            },
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+              "end": 66,
+              "loc": {
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+                  "column": 5
+                },
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+              },
+              "name": "function"
+            },
+            "computed": false,
+            "optional": true
+          },
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+            "end": 71,
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+            },
+            "name": "bar"
+          },
+          "computed": false,
+          "optional": true
+        }
+      }
+    ],
+    "directives": []
+  }
+}
\ No newline at end of file