Support falsy context value

Author: Sven Tschui

src/index.js

@@ -83,7 +83,7 @@ function renderToString(vnode, context, opts, inner, isSvgMode, selectValue) {
 				let cctx = cxType != null ? (provider ? provider.props.value : cxType._defaultValue) : context;
 
 				// stateless functional components
-				rendered = nodeName.call(vnode.__c, props, cctx || context);
+				rendered = nodeName.call(vnode.__c, props, cctx);
 			}
 			else {
 				// class-based components

test/context.js

@@ -30,4 +30,23 @@ describe('context', () => {
 			<section>value is: correct</section>
 		`);
 	});
+
+	it('should support falsy context value', () => {
+		const { Provider, Consumer } = createContext();
+		let rendered = renderJsx(
+			<Provider value={null}>
+				<Consumer>
+					{(value) => (
+						<section>
+							value is: {value}
+						</section>
+					)}
+				</Consumer>
+			</Provider>
+		);
+
+		expect(rendered).to.equal(dedent`
+			<section>value is: </section>
+		`);
+	});
 });