diff --git a/src/stencil-helmet.ts b/src/stencil-helmet.ts
index 1cef1c2..e0cc97b 100644
--- a/src/stencil-helmet.ts
+++ b/src/stencil-helmet.ts
@@ -6,7 +6,7 @@ const headExists = document && document.head;
 
 const validTagNames = Object.keys(RenderTypes);
 
-const isValidNode = (node: ChildNode) => validTagNames.indexOf(node.vtag as string) > -1;
+const isValidNode = (node: ChildNode) => node && validTagNames.indexOf(node.vtag as string) > -1;
 
 const renderNode = (node: ChildNode, utils: FunctionalUtilities): HTMLElement => RenderTypes[node.vtag as string](node, document.head, utils);