Fix error when no lane is defined in board

client/src/components/BoardPage/BoardPage.jsx

@@ -66,7 +66,7 @@ export class BoardPage extends React.Component {
   renderNewCardModal() {
     const { newCardModalActive, newCardLaneID } = this.state;
     const { board } = this.props;
-    if (!board) return null;
+    if (!board || !newCardLaneID) return null;
     return (
       <Modal active={newCardModalActive}>
         <div className="new-card-modal">