diff --git a/packages/happy-dom/src/query-selector/QuerySelector.ts b/packages/happy-dom/src/query-selector/QuerySelector.ts
index e0bd1f163..9798babe3 100644
--- a/packages/happy-dom/src/query-selector/QuerySelector.ts
+++ b/packages/happy-dom/src/query-selector/QuerySelector.ts
@@ -42,6 +42,11 @@ export default class QuerySelector {
 			return new NodeList<IElement>();
 		}
 
+		if (/^[.#\[]?\d/.test(selector)) {
+			throw new Error(
+				"Failed to execute 'querySelectorAll' on 'Element': '" + selector +"' is not a valid selector.");
+		}
+
 		const groups = SelectorParser.getSelectorGroups(selector);
 		let matches: IDocumentPositionAndElement[] = [];
 
@@ -89,6 +94,11 @@ export default class QuerySelector {
 			return null;
 		}
 
+		if (/^[.#\[]?\d/.test(selector)) {
+			throw new Error(
+				"Failed to execute 'querySelector' on 'Element': '" + selector +"' is not a valid selector.");
+		}
+
 		for (const items of SelectorParser.getSelectorGroups(selector)) {
 			const match =
 				node.nodeType === NodeTypeEnum.elementNode
diff --git a/packages/happy-dom/test/query-selector/QuerySelector.test.ts b/packages/happy-dom/test/query-selector/QuerySelector.test.ts
index de5c15bbd..98a8e1bc2 100644
--- a/packages/happy-dom/test/query-selector/QuerySelector.test.ts
+++ b/packages/happy-dom/test/query-selector/QuerySelector.test.ts
@@ -1126,5 +1126,37 @@ describe('QuerySelector', () => {
 			expect(element === div.children[0]).toBe(true);
 			expect(element2 === div.children[0]).toBe(true);
 		});
+
+		it('querySelector Trhow an error when provide selector is a invalid value', () => {
+			const div = document.createElement('div');
+			expect(() => div.querySelector('1')).toThrowError(
+				'Failed to execute \'querySelector\' on \'Element\': \'1\' is not a valid selector.'
+			);
+			expect(() => div.querySelector('[1')).toThrowError(
+				'Failed to execute \'querySelector\' on \'Element\': \'[1\' is not a valid selector.'
+			);
+			expect(() => div.querySelector('.1')).toThrowError(
+				'Failed to execute \'querySelector\' on \'Element\': \'.1\' is not a valid selector.'
+			);
+			expect(() => div.querySelector('#1')).toThrowError(
+				'Failed to execute \'querySelector\' on \'Element\': \'#1\' is not a valid selector.'
+			);
+		});
+
+		it('querySelectorAll Trhow an error when provide selector is a invalid value', () => {
+			const div = document.createElement('div');
+			expect(() => div.querySelectorAll('1')).toThrowError(
+				'Failed to execute \'querySelectorAll\' on \'Element\': \'1\' is not a valid selector.'
+			);
+			expect(() => div.querySelectorAll('[1')).toThrowError(
+				'Failed to execute \'querySelectorAll\' on \'Element\': \'[1\' is not a valid selector.'
+			);
+			expect(() => div.querySelectorAll('.1')).toThrowError(
+				'Failed to execute \'querySelectorAll\' on \'Element\': \'.1\' is not a valid selector.'
+			);
+			expect(() => div.querySelectorAll('#1')).toThrowError(
+				'Failed to execute \'querySelectorAll\' on \'Element\': \'#1\' is not a valid selector.'
+			);
+		});
 	});
 });