diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 9a614a5d..d890cc0b 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -761,9 +761,12 @@ getJasmineRequireObj().util = function(j$) {
     }
   };
 
-  util.assertStructuredCloneable = function(v, msgPrefix) {
+  util.assertReporterCloneable = function(v, msgPrefix) {
     try {
-      structuredClone(v);
+      // Reporter events are cloned internally via structuredClone, and it's
+      // common for reporters (including jasmine-browser-runner's) to JSON
+      // serialize them.
+      JSON.stringify(structuredClone(v));
     } catch (e) {
       throw new Error(`${msgPrefix} can't be cloned`, { cause: e });
     }
@@ -848,8 +851,8 @@ getJasmineRequireObj().Spec = function(j$) {
       // Key and value will eventually be cloned during reporting. The error
       // thrown at that point if they aren't cloneable isn't very helpful.
       // Throw a better one now.
-      j$.private.util.assertStructuredCloneable(key, 'Key');
-      j$.private.util.assertStructuredCloneable(value, 'Value');
+      j$.private.util.assertReporterCloneable(key, 'Key');
+      j$.private.util.assertReporterCloneable(value, 'Value');
       this.result.properties = this.result.properties || {};
       this.result.properties[key] = value;
     }
@@ -10631,8 +10634,8 @@ getJasmineRequireObj().Suite = function(j$) {
       // Key and value will eventually be cloned during reporting. The error
       // thrown at that point if they aren't cloneable isn't very helpful.
       // Throw a better one now.
-      j$.private.util.assertStructuredCloneable(key, 'Key');
-      j$.private.util.assertStructuredCloneable(value, 'Value');
+      j$.private.util.assertReporterCloneable(key, 'Key');
+      j$.private.util.assertReporterCloneable(value, 'Value');
       this.result.properties = this.result.properties || {};
       this.result.properties[key] = value;
     }
diff --git a/spec/core/SpecSpec.js b/spec/core/SpecSpec.js
index 13bcddf7..12370d6d 100644
--- a/spec/core/SpecSpec.js
+++ b/spec/core/SpecSpec.js
@@ -113,6 +113,18 @@ describe('Spec', function() {
       }).toThrowError("Key can't be cloned");
     });
 
+    it('throws if the key is not JSON-serializable', function() {
+      const spec = new privateUnderTest.Spec({
+        queueableFn: { fn: () => {} }
+      });
+
+      expect(function() {
+        const k = {};
+        k.self = k;
+        spec.setSpecProperty(k, '');
+      }).toThrowError("Key can't be cloned");
+    });
+
     it('throws if the value is not structured-cloneable', function() {
       const spec = new privateUnderTest.Spec({
         queueableFn: { fn: () => {} }
@@ -122,6 +134,18 @@ describe('Spec', function() {
         spec.setSpecProperty('k', new Promise(() => {}));
       }).toThrowError("Value can't be cloned");
     });
+
+    it('throws if the value is not JSON-serializable', function() {
+      const spec = new privateUnderTest.Spec({
+        queueableFn: { fn: () => {} }
+      });
+
+      expect(function() {
+        const v = {};
+        v.self = v;
+        spec.setSpecProperty('k', v);
+      }).toThrowError("Value can't be cloned");
+    });
   });
 
   describe('status', function() {
diff --git a/src/core/Spec.js b/src/core/Spec.js
index 2f3202d8..1a990cc9 100644
--- a/src/core/Spec.js
+++ b/src/core/Spec.js
@@ -74,8 +74,8 @@ getJasmineRequireObj().Spec = function(j$) {
       // Key and value will eventually be cloned during reporting. The error
       // thrown at that point if they aren't cloneable isn't very helpful.
       // Throw a better one now.
-      j$.private.util.assertStructuredCloneable(key, 'Key');
-      j$.private.util.assertStructuredCloneable(value, 'Value');
+      j$.private.util.assertReporterCloneable(key, 'Key');
+      j$.private.util.assertReporterCloneable(value, 'Value');
       this.result.properties = this.result.properties || {};
       this.result.properties[key] = value;
     }
diff --git a/src/core/Suite.js b/src/core/Suite.js
index 62a91216..96eabe2c 100644
--- a/src/core/Suite.js
+++ b/src/core/Suite.js
@@ -34,8 +34,8 @@ getJasmineRequireObj().Suite = function(j$) {
       // Key and value will eventually be cloned during reporting. The error
       // thrown at that point if they aren't cloneable isn't very helpful.
       // Throw a better one now.
-      j$.private.util.assertStructuredCloneable(key, 'Key');
-      j$.private.util.assertStructuredCloneable(value, 'Value');
+      j$.private.util.assertReporterCloneable(key, 'Key');
+      j$.private.util.assertReporterCloneable(value, 'Value');
       this.result.properties = this.result.properties || {};
       this.result.properties[key] = value;
     }
diff --git a/src/core/util.js b/src/core/util.js
index e0e9edbd..52ef4a74 100644
--- a/src/core/util.js
+++ b/src/core/util.js
@@ -80,9 +80,12 @@ getJasmineRequireObj().util = function(j$) {
     }
   };
 
-  util.assertStructuredCloneable = function(v, msgPrefix) {
+  util.assertReporterCloneable = function(v, msgPrefix) {
     try {
-      structuredClone(v);
+      // Reporter events are cloned internally via structuredClone, and it's
+      // common for reporters (including jasmine-browser-runner's) to JSON
+      // serialize them.
+      JSON.stringify(structuredClone(v));
     } catch (e) {
       throw new Error(`${msgPrefix} can't be cloned`, { cause: e });
     }