Program: 167499
Project: 167499
Buggy source:
protected void refreshUI(ExecutionData data){
  if (!ExecutionStatus.DONE.name().equals(statusLabel.getValue()) && !ExecutionStatus.CANCELLED.name().equals(statusLabel.getValue()) && !ExecutionStatus.ERROR.name().equals(statusLabel.getValue())) {
    flowLabel.setValue(data.execution.getFlowName());
    startLabel.setValue(formatDate(data.execution.getStartTime()));
    if (data.execution.getStatus().equals(ExecutionStatus.ERROR.name())) {
      statusLabel.setStyleName("String_Node_Str");
      statusLabel.setValue(FontAwesome.WARNING.getHtml() + "String_Node_Str" + data.execution.getStatus());
    }
 else     if (data.execution.getStatus().equals(ExecutionStatus.DONE.name())) {
      statusLabel.setStyleName("String_Node_Str");
      statusLabel.setValue(FontAwesome.CHECK.getHtml() + "String_Node_Str" + data.execution.getStatus());
    }
 else     if (data.execution.getStatus().equals(ExecutionStatus.RUNNING.name())) {
      statusLabel.setStyleName("String_Node_Str");
      statusLabel.setValue(FontAwesome.SPINNER.getHtml() + "String_Node_Str" + data.execution.getStatus());
    }
 else {
      statusLabel.setStyleName("String_Node_Str");
      statusLabel.setValue(data.execution.getStatus());
    }
    endLabel.setValue(formatDate(data.execution.getEndTime()));
    stepContainer.removeAllItems();
    stepContainer.addAll(data.steps);
    List<ExecutionStepLog> logMessages=new ArrayList<ExecutionStepLog>(logContainer.getItemIds());
    for (    ExecutionStepLog logMsg : data.logs) {
      logMessages.remove(logMsg);
    }
    if (logMessages.size() > 0) {
      logContainer.removeAllItems();
      logContainer.addAll(data.logs);
    }
  }
}

Fixed version (ground truth):
protected void refreshUI(ExecutionData data){
  if (!ExecutionStatus.DONE.name().equals(statusLabel.getValue()) && !ExecutionStatus.CANCELLED.name().equals(statusLabel.getValue()) && !ExecutionStatus.ERROR.name().equals(statusLabel.getValue())) {
    flowLabel.setValue(data.execution.getFlowName());
    startLabel.setValue(formatDate(data.execution.getStartTime()));
    if (data.execution.getStatus() != null) {
      if (data.execution.getStatus().equals(ExecutionStatus.ERROR.name())) {
        statusLabel.setStyleName("String_Node_Str");
        statusLabel.setValue(FontAwesome.WARNING.getHtml() + "String_Node_Str" + data.execution.getStatus());
      }
 else       if (data.execution.getStatus().equals(ExecutionStatus.DONE.name())) {
        statusLabel.setStyleName("String_Node_Str");
        statusLabel.setValue(FontAwesome.CHECK.getHtml() + "String_Node_Str" + data.execution.getStatus());
      }
 else       if (data.execution.getStatus().equals(ExecutionStatus.RUNNING.name())) {
        statusLabel.setStyleName("String_Node_Str");
        statusLabel.setValue(FontAwesome.SPINNER.getHtml() + "String_Node_Str" + data.execution.getStatus());
      }
 else {
        statusLabel.setStyleName("String_Node_Str");
        statusLabel.setValue(data.execution.getStatus());
      }
    }
    endLabel.setValue(formatDate(data.execution.getEndTime()));
    stepContainer.removeAllItems();
    stepContainer.addAll(data.steps);
    List<ExecutionStepLog> logMessages=new ArrayList<ExecutionStepLog>(logContainer.getItemIds());
    for (    ExecutionStepLog logMsg : data.logs) {
      logMessages.remove(logMsg);
    }
    if (logMessages.size() > 0) {
      logContainer.removeAllItems();
      logContainer.addAll(data.logs);
    }
  }
}