Program: 51433
Project: 51433
Buggy source:
@Override public Inventory importInventory(final String inventoryName,WorldGroup worldGroup,BetterEnderChest plugin) throws IOException {
  String groupName=worldGroup.getGroupName();
  if (plugin.isSpecialChest(inventoryName)) {
    return null;
  }
  MultiverseInventories multiverseInventories=(MultiverseInventories)Bukkit.getServer().getPluginManager().getPlugin("String_Node_Str");
  boolean foundMatchingGroup=false;
  List<WorldGroupProfile> multiverseInventoriesGroups=multiverseInventories.getGroupManager().getGroups();
  for (  WorldGroupProfile group : multiverseInventoriesGroups) {
    if (group.getName().equalsIgnoreCase(groupName)) {
      groupName=group.getName();
      foundMatchingGroup=true;
      break;
    }
  }
  if (!foundMatchingGroup) {
    plugin.log("String_Node_Str" + groupName + "String_Node_Str"+ inventoryName+ "String_Node_Str",Level.WARNING);
    return null;
  }
  GlobalProfile globalProfile=multiverseInventories.getData().getGlobalProfile(inventoryName);
  if (multiverseInventories.getGroupManager().getGroup(groupName).containsWorld(globalProfile.getWorld())) {
    return plugin.getInventoryImporters().getRegistration("String_Node_Str").importInventory(inventoryName,worldGroup,plugin);
  }
 else {
    ProfileType profileType;
    if (multiverseInventories.getMVIConfig().isUsingGameModeProfiles()) {
      profileType=ProfileTypes.forGameMode(Bukkit.getDefaultGameMode());
    }
 else {
      profileType=ProfileTypes.SURVIVAL;
    }
    PlayerProfile playerData=multiverseInventories.getGroupManager().getGroup(groupName).getPlayerData(profileType,Bukkit.getOfflinePlayer(inventoryName));
    if (playerData == null) {
      return null;
    }
    ItemStack[] stacks=playerData.get(Sharables.ENDER_CHEST);
    if (stacks == null || stacks.length == 0) {
      return null;
    }
    Inventory betterInventory=plugin.getSaveAndLoadSystem().loadEmptyInventory(inventoryName);
    betterInventory.setContents(stacks);
    return betterInventory;
  }
}

Fixed version (ground truth):
@Override public Inventory importInventory(final String inventoryName,WorldGroup worldGroup,BetterEnderChest plugin) throws IOException {
  String groupName=worldGroup.getGroupName();
  if (plugin.isSpecialChest(inventoryName)) {
    return null;
  }
  MultiverseInventories multiverseInventories=(MultiverseInventories)Bukkit.getServer().getPluginManager().getPlugin("String_Node_Str");
  WorldGroupProfile group=null;
  List<WorldGroupProfile> multiverseInventoriesGroups=multiverseInventories.getGroupManager().getGroups();
  for (  WorldGroupProfile aGroup : multiverseInventoriesGroups) {
    if (aGroup.getName().equalsIgnoreCase(groupName)) {
      group=aGroup;
      break;
    }
  }
  if (group == null) {
    plugin.log("String_Node_Str" + groupName + "String_Node_Str"+ inventoryName+ "String_Node_Str",Level.WARNING);
    return null;
  }
  GlobalProfile globalProfile=multiverseInventories.getData().getGlobalProfile(inventoryName);
  if (globalProfile == null) {
    return null;
  }
  if (group.containsWorld(globalProfile.getWorld())) {
    return plugin.getInventoryImporters().getRegistration("String_Node_Str").importInventory(inventoryName,worldGroup,plugin);
  }
 else {
    ProfileType profileType;
    if (multiverseInventories.getMVIConfig().isUsingGameModeProfiles()) {
      profileType=ProfileTypes.forGameMode(Bukkit.getDefaultGameMode());
    }
 else {
      profileType=ProfileTypes.SURVIVAL;
    }
    PlayerProfile playerData=multiverseInventories.getGroupManager().getGroup(groupName).getPlayerData(profileType,Bukkit.getOfflinePlayer(inventoryName));
    if (playerData == null) {
      return null;
    }
    ItemStack[] stacks=playerData.get(Sharables.ENDER_CHEST);
    if (stacks == null || stacks.length == 0) {
      return null;
    }
    Inventory betterInventory=plugin.getSaveAndLoadSystem().loadEmptyInventory(inventoryName);
    betterInventory.setContents(stacks);
    return betterInventory;
  }
}