diff --git a/packages/happy-dom/src/console/VirtualConsoleLogLevelEnum.ts b/packages/happy-dom/src/console/VirtualConsoleLogLevelEnum.ts
index 2244fffa5..9a692d1be 100644
--- a/packages/happy-dom/src/console/VirtualConsoleLogLevelEnum.ts
+++ b/packages/happy-dom/src/console/VirtualConsoleLogLevelEnum.ts
@@ -4,9 +4,9 @@
  * @see https://console.spec.whatwg.org/#loglevel-severity
  */
 enum VirtualConsoleLogLevelEnum {
-	error = 0,
-	warn = 1,
-	info = 2,
-	log = 3
+	log = 0,
+	info = 1,
+	warn = 2,
+	error = 3
 }
 export default VirtualConsoleLogLevelEnum;
diff --git a/packages/happy-dom/src/console/VirtualConsoleUtility.ts b/packages/happy-dom/src/console/VirtualConsoleUtility.ts
index db03d551c..b76a56d17 100644
--- a/packages/happy-dom/src/console/VirtualConsoleUtility.ts
+++ b/packages/happy-dom/src/console/VirtualConsoleUtility.ts
@@ -11,14 +11,14 @@ export default class VirtualConsoleUtility {
 	public static stringifyMessage(message: Array<string | object>): string {
 		let output = '';
 		for (const part of message) {
-			if (typeof part === 'object') {
+			if (typeof part === 'object' && (part === null || part.constructor.name === 'Object')) {
 				try {
 					output += JSON.stringify(part, null, 3);
 				} catch (error) {
 					output += '["Failed stringify object in log entry."]';
 				}
 			} else {
-				output += part;
+				output += String(part);
 			}
 		}
 		return output;
diff --git a/packages/happy-dom/src/window/WindowErrorUtility.ts b/packages/happy-dom/src/window/WindowErrorUtility.ts
index fabe0d273..5823a4553 100644
--- a/packages/happy-dom/src/window/WindowErrorUtility.ts
+++ b/packages/happy-dom/src/window/WindowErrorUtility.ts
@@ -56,10 +56,12 @@ export default class WindowErrorUtility {
 	 */
 	public static dispatchError(elementOrWindow: IWindow | IElement, error: Error): void {
 		if ((<IWindow>elementOrWindow).console) {
-			(<IWindow>elementOrWindow).console.error(error);
+			(<IWindow>elementOrWindow).console.error(error.message + '\n' + error.stack);
 			elementOrWindow.dispatchEvent(new ErrorEvent('error', { message: error.message, error }));
 		} else {
-			(<IElement>elementOrWindow).ownerDocument.defaultView.console.error(error);
+			(<IElement>elementOrWindow).ownerDocument.defaultView.console.error(
+				error.message + '\n' + error.stack
+			);
 			(<IElement>elementOrWindow).dispatchEvent(
 				new ErrorEvent('error', { message: error.message, error })
 			);
diff --git a/packages/uncaught-exception-observer/src/UncaughtExceptionObserver.ts b/packages/uncaught-exception-observer/src/UncaughtExceptionObserver.ts
index 5be0ad681..aca382582 100644
--- a/packages/uncaught-exception-observer/src/UncaughtExceptionObserver.ts
+++ b/packages/uncaught-exception-observer/src/UncaughtExceptionObserver.ts
@@ -34,17 +34,15 @@ export default class UncaughtExceptionObserver {
 				return;
 			}
 
-			if (
-				error instanceof this.window.Error &&
-				error.stack?.includes('at main (eval') &&
-				error.stack?.includes('/happy-dom/')
-			) {
-				this.window.console.error(error);
+			if (error instanceof this.window.Error && error.stack?.includes('/happy-dom/')) {
+				this.window.console.error(error.message + '\n' + error.stack);
 				this.window.dispatchEvent(new ErrorEvent('error', { error, message: error.message }));
 			} else if (
 				process.listenerCount('uncaughtException') ===
 				(<typeof UncaughtExceptionObserver>this.constructor).listenerCount
 			) {
+				// eslint-disable-next-line no-console
+				console.error(error.message + '\n' + error.stack);
 				// Exit if there are no other listeners handling the error.
 				process.exit(1);
 			}
@@ -53,17 +51,15 @@ export default class UncaughtExceptionObserver {
 		// The "uncaughtException" event is not always triggered for unhandled rejections.
 		// Therefore we want to use the "unhandledRejection" event as well.
 		this.uncaughtRejectionListener = (error: Error) => {
-			if (
-				error instanceof this.window.Error &&
-				error.stack?.includes('at main (eval') &&
-				error.stack?.includes('/happy-dom/')
-			) {
-				this.window.console.error(error);
+			if (error instanceof this.window.Error && error.stack?.includes('/happy-dom/')) {
+				this.window.console.error(error.message + '\n' + error.stack);
 				this.window.dispatchEvent(new ErrorEvent('error', { error, message: error.message }));
 			} else if (
 				process.listenerCount('unhandledRejection') ===
 				(<typeof UncaughtExceptionObserver>this.constructor).listenerCount
 			) {
+				// eslint-disable-next-line no-console
+				console.error(error.message + '\n' + error.stack);
 				// Exit if there are no other listeners handling the error.
 				process.exit(1);
 			}
@@ -77,6 +73,10 @@ export default class UncaughtExceptionObserver {
 	 * Disconnects observer.
 	 */
 	public disconnect(): void {
+		if (!this.window) {
+			return;
+		}
+
 		(<typeof UncaughtExceptionObserver>this.constructor).listenerCount--;
 
 		process.off('uncaughtException', this.uncaughtExceptionListener);
diff --git a/packages/uncaught-exception-observer/test/UncaughtExceptionObserver.test.ts b/packages/uncaught-exception-observer/test/UncaughtExceptionObserver.test.ts
index ff47e6cf8..eb3bbb647 100644
--- a/packages/uncaught-exception-observer/test/UncaughtExceptionObserver.test.ts
+++ b/packages/uncaught-exception-observer/test/UncaughtExceptionObserver.test.ts
@@ -55,7 +55,7 @@ async function itObservesUncaughtExceptions(): Promise<void> {
 
 	window.addEventListener('error', (event) => (errorEvent = <ErrorEvent>event));
 
-	window['customSetTimeout'] = setTimeout;
+	window['customSetTimeout'] = setTimeout.bind(globalThis);
 
 	document.write(`
         <script>
@@ -63,7 +63,7 @@ async function itObservesUncaughtExceptions(): Promise<void> {
                 function main() {
                     customSetTimeout(() => {
                         throw new Error('Test error');
-                    });
+                    }, 0);
                 }
 
                 main();
@@ -75,8 +75,17 @@ async function itObservesUncaughtExceptions(): Promise<void> {
 
 	observer.disconnect();
 
-	const actualConsoleOutput = window.happyDOM.virtualConsolePrinter.readAsString();
-	const expectedConsoleOutput = ``;
+	const actualConsoleOutput = window.happyDOM.virtualConsolePrinter
+		.readAsString()
+		.replace(/[\s0-9]|\(file:.+\/happy-dom\//gm, '');
+	const expectedConsoleOutput = `Test error
+    Error: Test error
+        at Timeout.eval [as _onTimeout] (eval at <anonymous> (file:///home/user/happy-dom/packages/happy-dom/lib/nodes/html-script-element/HTMLScriptElement.js:171:126), <anonymous>:5:31)
+        at listOnTimeout (node:internal/timers:559:17)
+        at processTimers (node:internal/timers:502:7)`.replace(
+		/[\s0-9]|\(file:.+\/happy-dom\//gm,
+		''
+	);
 
 	if (actualConsoleOutput !== expectedConsoleOutput) {
 		throw new Error(`Console output not correct.`);
@@ -95,5 +104,15 @@ async function itObservesUncaughtExceptions(): Promise<void> {
 	}
 }
 
-itObservesUnhandledRejections();
-itObservesUncaughtExceptions();
+async function main(): Promise<void> {
+	try {
+		await itObservesUnhandledRejections();
+		await itObservesUncaughtExceptions();
+	} catch (error) {
+		// eslint-disable-next-line no-console
+		console.error(error);
+		process.exit(1);
+	}
+}
+
+main();