Program: 126025
Project: 126025
Buggy source:
public static List<MetadataTable> getMetadataTablesFromItem(Item item){
  if (item == null) {
    return null;
  }
  if (item instanceof ConnectionItem) {
    final Connection connection=((ConnectionItem)item).getConnection();
    if (connection != null) {
      if (connection instanceof SAPConnection) {
        final SAPConnection sapConnection=(SAPConnection)connection;
        final EList functions=sapConnection.getFuntions();
        if (functions != null && !functions.isEmpty()) {
          final EList tables=new BasicEList();
          for (int i=0; i < functions.size(); i++) {
            tables.add(((SAPFunctionUnit)functions.get(i)).getMetadataTable());
          }
          return tables;
        }
      }
      final Set<MetadataTable> tableset=ConnectionHelper.getTables(connection);
      if (tableset != null) {
        EList<MetadataTable> tables=new BasicEList<MetadataTable>();
        tables.addAll(tableset);
        return tables;
      }
    }
  }
  return null;
}

Fixed version (ground truth):
public static List<MetadataTable> getMetadataTablesFromItem(Item item){
  if (item == null) {
    return null;
  }
  if (item instanceof ConnectionItem) {
    final Connection connection=((ConnectionItem)item).getConnection();
    if (connection != null) {
      if (connection instanceof SAPConnection) {
        final SAPConnection sapConnection=(SAPConnection)connection;
        final EList functions=sapConnection.getFuntions();
        if (functions != null && !functions.isEmpty()) {
          final EList tables=new BasicEList();
          for (int i=0; i < functions.size(); i++) {
            tables.add(((SAPFunctionUnit)functions.get(i)).getMetadataTable());
          }
          return tables;
        }
      }
      IGenericWizardService wizardService=null;
      if (GlobalServiceRegister.getDefault().isServiceRegistered(IGenericWizardService.class)) {
        wizardService=(IGenericWizardService)GlobalServiceRegister.getDefault().getService(IGenericWizardService.class);
      }
      if (wizardService != null) {
        Property property=((ConnectionItem)item).getProperty();
        if (property != null && property.getId() != null) {
          try {
            IRepositoryViewObject repObject=CoreRuntimePlugin.getInstance().getProxyRepositoryFactory().getLastVersion(ProjectManager.getInstance().getCurrentProject(),property.getId());
            if (repObject != null && wizardService.isGenericType(repObject.getRepositoryObjectType())) {
              List<MetadataTable> metadataTables=wizardService.getMetadataTables(connection);
              EList<MetadataTable> tables=new BasicEList<MetadataTable>();
              if (metadataTables != null) {
                tables.addAll(metadataTables);
                return tables;
              }
            }
          }
 catch (          PersistenceException e) {
            e.printStackTrace();
          }
        }
      }
      final Set<MetadataTable> tableset=ConnectionHelper.getTables(connection);
      if (tableset != null) {
        EList<MetadataTable> tables=new BasicEList<MetadataTable>();
        tables.addAll(tableset);
        return tables;
      }
    }
  }
  return null;
}