Update client.js - store groups as string.

client/js/client.js

@@ -117,8 +117,9 @@ function onStartAllocate() {
 }
 
 function resumeStaff() {
+	// allow rebuilding of data from localStorage cache
 	if ( window.localStorage.groups ){
-		rebuildGroups(window.localStorage.groups);
+		rebuildGroups(JSON.parse( window.localStorage.groups ));
 	}
 }
 
@@ -131,7 +132,7 @@ function showGroups(payload) {
     const group = payload.groups[groupID];
     groupCache.push( group );
   }
-  window.localStorage.groups = groupCache;
+  window.localStorage.groups = JSON.stringify(groupCache);
 }
 
 function rebuildGroups(groups) {