From 2920e895b5c8f528dc406b39cdd0b0c89c824f05 Mon Sep 17 00:00:00 2001
From: Evert Timberg <evert.timberg@gmail.com>
Date: Sun, 18 Jul 2021 09:11:45 -0400
Subject: [PATCH 1/2] Ensure getPrototypeOf will not crash on plugin options
 with no scopes

---
 src/helpers/helpers.config.js       |  2 +-
 test/specs/core.controller.tests.js | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/helpers/helpers.config.js b/src/helpers/helpers.config.js
index ce78ec68fa9..62f47949554 100644
--- a/src/helpers/helpers.config.js
+++ b/src/helpers/helpers.config.js
@@ -54,7 +54,7 @@ export function _createResolver(scopes, prefixes = [''], rootScopes = scopes, fa
      * A trap for Object.getPrototypeOf.
      */
     getPrototypeOf() {
-      return Reflect.getPrototypeOf(scopes[0]);
+      return Reflect.getPrototypeOf(scopes[0] || Object.create(null));
     },
 
     /**
diff --git a/test/specs/core.controller.tests.js b/test/specs/core.controller.tests.js
index 393983852d2..0058bb3872f 100644
--- a/test/specs/core.controller.tests.js
+++ b/test/specs/core.controller.tests.js
@@ -1707,6 +1707,23 @@ describe('Chart', function() {
         'before-0', 'after-0'
       ]);
     });
+
+    it('should not crash when accessing options of a blank inline plugin', function() {
+      var chart = window.acquireChart({
+        type: 'line',
+        data: {datasets: [{}]},
+        plugins: [{}],
+      });
+
+      function iterateOptions() {
+        for (const plugin of chart._plugins._init) {
+          // triggering bug https://github.com/chartjs/Chart.js/issues/9368
+          expect(Object.getPrototypeOf(plugin.options)).toBeNull();
+        }
+      }
+
+      expect(iterateOptions).not.toThrow();
+    });
   });
 
   describe('metasets', function() {

From 7914ab10426c304fc6d3ca0dc16fe06fee3bee0d Mon Sep 17 00:00:00 2001
From: Evert Timberg <evert.timberg@gmail.com>
Date: Fri, 23 Jul 2021 20:05:26 -0400
Subject: [PATCH 2/2] Code review improvements

---
 src/core/core.config.js       | 3 +++
 src/helpers/helpers.config.js | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/core/core.config.js b/src/core/core.config.js
index ff97d5f7572..927437d4703 100644
--- a/src/core/core.config.js
+++ b/src/core/core.config.js
@@ -277,6 +277,9 @@ export default class Config {
     });
 
     const array = Array.from(scopes);
+    if (array.length === 0) {
+      array.push(Object.create(null));
+    }
     if (keysCached.has(keyLists)) {
       cache.set(keyLists, array);
     }
diff --git a/src/helpers/helpers.config.js b/src/helpers/helpers.config.js
index 62f47949554..ce78ec68fa9 100644
--- a/src/helpers/helpers.config.js
+++ b/src/helpers/helpers.config.js
@@ -54,7 +54,7 @@ export function _createResolver(scopes, prefixes = [''], rootScopes = scopes, fa
      * A trap for Object.getPrototypeOf.
      */
     getPrototypeOf() {
-      return Reflect.getPrototypeOf(scopes[0] || Object.create(null));
+      return Reflect.getPrototypeOf(scopes[0]);
     },
 
     /**