anchor.diff:                for (int j = 0; j < numMetaReplicas; j++) {
                   RegionInfo meta = RegionReplicaUtil.getRegionInfoForReplica(
                           RegionInfoBuilder.FIRST_META_REGIONINFO, j);
  -                ServerName metaLocation = MetaTableLocator.waitMetaRegionLocation(master.getZooKeeper(), j, 1);
  +                //If a metaLocation is null, All of its info would be empty here to be displayed.
  +                ServerName metaLocation = null;
  +                try {
  +                  metaLocation = MetaTableLocator.waitMetaRegionLocation(master.getZooKeeper(), j, 1);
  +                } catch (NotAllMetaRegionsOnlineException e) {
  +                  //Region in transition state here throw a NotAllMetaRegionsOnlineException causes
  +                  //the UI crash.
  +                }
                   for (int i = 0; i < 1; i++) {
  +                  //If metaLocation is null, default value below would be displayed in UI.
                     String hostAndPort = "";
                     long compactingCells = 0;
                     long compactedCells = 0;
  
positive.code:                for (int j = 0; j < numMetaReplicas; j++) {
                   RegionInfo meta = RegionReplicaUtil.getRegionInfoForReplica(
                                           RegionInfoBuilder.FIRST_META_REGIONINFO, j);
                   ServerName metaLocation = MetaTableLocator.waitMetaRegionLocation(master.getZooKeeper(), j, 1);
                   for (int i = 0; i < 1; i++) {
                     String hostAndPort = "";
                     float locality = 0.0f;
                     float localityForSsd = 0.0f;
  
negative.code:   import="org.apache.hadoop.hbase.master.http.MetaBrowser"
    import="org.apache.hadoop.hbase.master.http.RegionReplicaInfo"
    import="org.apache.hadoop.hbase.quotas.QuotaSettingsFactory"
    import="org.apache.hadoop.hbase.quotas.QuotaTableUtil"
    import="org.apache.hadoop.hbase.NotAllMetaRegionsOnlineException" %>
  <%@ page import="org.apache.hadoop.hbase.quotas.SpaceQuotaSnapshot" %>
  <%@ page import="org.apache.hadoop.hbase.quotas.ThrottleSettings" %>
  <%@ page import="org.apache.hadoop.hbase.util.Bytes" %>
  