diff --git a/src/components/grid/Grid.ts b/src/components/grid/Grid.ts
index 79fd610..1d3379f 100644
--- a/src/components/grid/Grid.ts
+++ b/src/components/grid/Grid.ts
@@ -78,6 +78,9 @@ export class Grid implements m.Component<IGridAttrs> {
     return children.map((col: m.Vnode<IColAttrs>) => {
       if (col == null || col.tag === '#') return;
 
+      if (typeof (col) !== 'object')
+        return col;
+
       if (col.tag === '[') {
         return this.renderCols(col.children as m.ChildArray, gutter);
       }