Ignore non-VNode objects during rendering

This fixes #245.
preactjs · Sep 12, 2022 · 8c7b001 · 8c7b001
1 parent 60075a5
commit 8c7b001
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/index.js b/src/index.js
@@ -209,6 +209,9 @@ function _renderToString(vnode, context, isSvgMode, selectValue, parent) {
 		}
 		return rendered;
 	}
+
+	// VNodes have {constructor:undefined} to prevent JSON injection:
+	if (vnode.constructor !== undefined) return '';
 
 	vnode[PARENT] = parent;
 	if (options[DIFF]) options[DIFF](vnode);