Program: 17190
Project: 17190
Buggy source:
public void onPluginEnable(PluginEnableEvent event){
  if (!this.Methods.hasMethod()) {
    if (this.Methods.setMethod(event.getPlugin())) {
      Economy.economy=this.Methods.getMethod();
      System.out.println("String_Node_Str" + Economy.economy.getName() + "String_Node_Str"+ Economy.economy.getVersion()+ "String_Node_Str");
    }
  }
  if (Permission.permissions == null) {
    Plugin permissions=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (permissions != null) {
      Permission.permissions=((Permissions)permissions).getHandler();
      PluginDescriptionFile pDesc=permissions.getDescription();
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
  if (LWCplugin.lwc == null) {
    Plugin lwcPlugin=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (lwcPlugin != null) {
      PluginDescriptionFile pDesc=lwcPlugin.getDescription();
      LWCplugin.lwc=((LWCPlugin)lwcPlugin).getLWC();
      Security.protection=new LWCplugin();
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
  if (Odd.oddItem == null) {
    Plugin oddItem=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (oddItem != null) {
      PluginDescriptionFile pDesc=oddItem.getDescription();
      Odd.oddItem=(OddItem)ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
  if (LockettePlugin.lockette == null) {
    Plugin lockette=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (lockette != null) {
      PluginDescriptionFile pDesc=lockette.getDescription();
      LockettePlugin.lockette=((Lockette)lockette);
      Security.protection=new LockettePlugin();
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
}

Fixed version (ground truth):
public void onPluginEnable(PluginEnableEvent event){
  if (!this.methods.hasMethod()) {
    if (methods.setMethod(event.getPlugin())) {
      Economy.economy=methods.getMethod();
      System.out.println("String_Node_Str" + Economy.economy.getName() + "String_Node_Str"+ Economy.economy.getVersion()+ "String_Node_Str");
    }
  }
  if (Permission.permissions == null) {
    Plugin permissions=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (permissions != null) {
      Permission.permissions=((Permissions)permissions).getHandler();
      PluginDescriptionFile pDesc=permissions.getDescription();
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
  if (LWCplugin.lwc == null) {
    Plugin lwcPlugin=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (lwcPlugin != null) {
      PluginDescriptionFile pDesc=lwcPlugin.getDescription();
      LWCplugin.lwc=((LWCPlugin)lwcPlugin).getLWC();
      Security.protection=new LWCplugin();
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
  if (Odd.oddItem == null) {
    Plugin oddItem=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (oddItem != null) {
      PluginDescriptionFile pDesc=oddItem.getDescription();
      Odd.oddItem=(OddItem)ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
  if (LockettePlugin.lockette == null) {
    Plugin lockette=ChestShop.getBukkitServer().getPluginManager().getPlugin("String_Node_Str");
    if (lockette != null) {
      PluginDescriptionFile pDesc=lockette.getDescription();
      LockettePlugin.lockette=((Lockette)lockette);
      Security.protection=new LockettePlugin();
      System.out.println("String_Node_Str" + pDesc.getName() + "String_Node_Str"+ pDesc.getVersion()+ "String_Node_Str");
    }
  }
}