backport #3919

Author: JoviDeCroock

src/create-element.js

@@ -56,7 +56,11 @@ export function createElement(type, props, children) {
  */
 export function normalizeToVNode(childVNode) {
 	let type = typeof childVNode;
-	if (childVNode == null || type == 'boolean') {
+	if (
+		childVNode == null ||
+		type == 'boolean' ||
+		typeof childVNode == 'function'
+	) {
 		return null;
 	}
 

test/browser/render.test.js

@@ -1177,6 +1177,16 @@ describe('render()', () => {
 		expect(scratch.querySelector('p').contentEditable).to.equal('false');
 	});
 
+	it('should not render children when rerendering a function child', () => {
+		const icon = () => {};
+
+		render(<div>{icon}</div>, scratch);
+		expect(scratch.innerHTML).to.equal('<div></div>');
+
+		render(<div>{icon}</div>, scratch);
+		expect(scratch.innerHTML).to.equal('<div></div>');
+	});
+
 	// #3060
 	it('should reset tabindex on undefined/null', () => {
 		const defaultValue = isIE11 ? 0 : -1;