refine last commit

src/module/cytoscapeMap.js

@@ -268,7 +268,8 @@ export default function cytoscapeMap(mapData, dataLayerType, dataLayerOption, cu
     // 若曾經儲存過拜訪後的座標位置，則restore位置來渲染出來
     if (localStorage.getItem(SAVE_KEY_NAME) && JSON.parse(localStorage.getItem(SAVE_KEY_NAME))) {
       const allGraphsRemembered = JSON.parse(localStorage.getItem(SAVE_KEY_NAME));
-      const currentGraphNodesRemembered = allGraphsRemembered[cytoscapeStore.currentGraphId][rank]; // 可能是undefined
+      const currentGraphNodesRemembered =
+        allGraphsRemembered[cytoscapeStore.currentGraphId] ? allGraphsRemembered[cytoscapeStore.currentGraphId][rank] : null; // 可能是undefined
       if (currentGraphNodesRemembered) {
         currentGraphNodesRemembered.forEach(nodeRemembered => {
           const nodeToDecide = cy.getElementById(nodeRemembered.id);