From 6dcb9f51204919dc890414271a085cdb7fde4c09 Mon Sep 17 00:00:00 2001
From: moklick <info@moritzklack.com>
Date: Mon, 11 May 2020 18:50:09 +0200
Subject: [PATCH] refactor(renderer): show error when no width or height is set
 #196

---
 src/container/GraphView/index.tsx | 5 +++++
 src/container/ReactFlow/index.tsx | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/container/GraphView/index.tsx b/src/container/GraphView/index.tsx
index aa78cef8..3423c334 100644
--- a/src/container/GraphView/index.tsx
+++ b/src/container/GraphView/index.tsx
@@ -89,6 +89,11 @@ const GraphView = memo(
       }
 
       const size = getDimensions(rendererNode.current);
+
+      if (size.height === 0 || size.width === 0) {
+        throw new Error('The React Flow parent container needs a width and a height to render the graph.');
+      }
+
       updateSize(size);
     };
 
diff --git a/src/container/ReactFlow/index.tsx b/src/container/ReactFlow/index.tsx
index d7c86841..371a0deb 100644
--- a/src/container/ReactFlow/index.tsx
+++ b/src/container/ReactFlow/index.tsx
@@ -49,7 +49,7 @@ export interface ReactFlowProps extends Omit<HTMLAttributes<HTMLDivElement>, 'on
 const ReactFlow = ({
   style,
   onElementClick,
-  elements,
+  elements = [],
   children,
   nodeTypes,
   edgeTypes,