Program: 88444
Project: 88444
Buggy source:
@Override public void actionPerformed(ActionEvent e){
  Stereotype documentStereotype=Utils.getDocumentStereotype(project);
  Stereotype viewStereotype=Utils.getViewStereotype(project);
  for (  Element element : targetElements) {
    if (!StereotypesHelper.hasStereotypeOrDerived(element,viewStereotype) && !StereotypesHelper.hasStereotypeOrDerived(element,documentStereotype)) {
      continue;
    }
    Project project=Project.getProject(element);
    URIBuilder uriBase=MMSUtils.getServiceUri(project);
    if (uriBase == null) {
      Application.getInstance().getGUILog().log("String_Node_Str");
      return;
    }
    uriBase.setHost(uriBase.getHost() + "String_Node_Str");
    String uriPath="String_Node_Str" + Converters.getIProjectToIdConverter().apply(project.getPrimaryProject());
    String branchName=EsiUtils.getCurrentBranch(project.getPrimaryProject()).getName();
    uriPath+="String_Node_Str" + (branchName.equals("String_Node_Str") ? "String_Node_Str" : branchName);
    Set<Element> documents=new HashSet<>();
    ArrayList<Element> viewChain=new ArrayList<>();
    viewChain.add(element);
    for (int i=0; i < viewChain.size(); i++) {
      if (StereotypesHelper.hasStereotype(viewChain.get(i),documentStereotype)) {
        documents.add(viewChain.get(i));
      }
      Set<Element> childViews=new HashSet<>();
      for (      Property prop : ((Class)viewChain.get(i)).getOwnedAttribute()) {
        if (!(prop.getType() instanceof Class)) {
          continue;
        }
        Class type=(Class)prop.getType();
        if (type == null || !(StereotypesHelper.hasStereotypeOrDerived(type,viewStereotype) || StereotypesHelper.hasStereotypeOrDerived(type,documentStereotype))) {
          continue;
        }
        childViews.add(type);
      }
      for (      Relationship relation : viewChain.get(i).get_relationshipOfRelatedElement()) {
        if (!(relation instanceof Association)) {
          continue;
        }
        Element assocEnd=((Association)relation).getMemberEnd().get(0).getOwner();
        if (!StereotypesHelper.hasStereotypeOrDerived(assocEnd,viewStereotype) && !StereotypesHelper.hasStereotypeOrDerived(assocEnd,documentStereotype)) {
          continue;
        }
        if (!childViews.contains(assocEnd) && !viewChain.contains(assocEnd)) {
          viewChain.add(assocEnd);
        }
      }
    }
    if (documents.size() > 1) {
      String label="String_Node_Str";
      List<JButton> linkButtons=new ArrayList<>();
      try {
        if (!documents.isEmpty()) {
          label="String_Node_Str" + element.getHumanName() + "String_Node_Str";
          for (          Element doc : documents) {
            if (doc.equals(element)) {
              uriPath+="String_Node_Str" + Converters.getElementToIdConverter().apply(element);
            }
 else {
              uriPath+="String_Node_Str" + Converters.getElementToIdConverter().apply(doc) + "String_Node_Str"+ Converters.getElementToIdConverter().apply(element);
            }
            JButton button=new ViewButton(doc.getHumanName(),uriBase.setPath(uriPath).build());
            linkButtons.add(button);
          }
        }
      }
 catch (      URISyntaxException se) {
        Application.getInstance().getGUILog().log("String_Node_Str" + element.getHumanName() + "String_Node_Str");
        return;
      }
      ViewEditorLinkForm viewLinkForm=new ViewEditorLinkForm(label,linkButtons);
      viewLinkForm.setVisible(true);
    }
 else {
      uriPath+="String_Node_Str" + Converters.getElementToIdConverter().apply(element) + "String_Node_Str"+ Converters.getElementToIdConverter().apply(element);
      if (Desktop.isDesktopSupported()) {
        try {
          if (documents.size() == 0) {
            Application.getInstance().getGUILog().log("String_Node_Str" + element.getHumanName() + "String_Node_Str");
          }
          Desktop.getDesktop().browse(uriBase.setPath(uriPath).build());
        }
 catch (        URISyntaxException|IOException e1) {
          Application.getInstance().getGUILog().log("String_Node_Str" + uriBase.toString());
          e1.printStackTrace();
        }
      }
 else {
        Application.getInstance().getGUILog().log("String_Node_Str" + uriBase.toString());
      }
    }
  }
}

Fixed version (ground truth):
@Override public void actionPerformed(ActionEvent e){
  Stereotype documentStereotype=Utils.getDocumentStereotype(project);
  Stereotype viewStereotype=Utils.getViewStereotype(project);
  for (  Element element : targetElements) {
    if (!StereotypesHelper.hasStereotypeOrDerived(element,viewStereotype) && !StereotypesHelper.hasStereotypeOrDerived(element,documentStereotype)) {
      continue;
    }
    URIBuilder uriBase=MMSUtils.getServiceUri(project);
    if (uriBase == null) {
      Application.getInstance().getGUILog().log("String_Node_Str");
      return;
    }
    uriBase.setHost(uriBase.getHost() + "String_Node_Str");
    String uriPath="String_Node_Str" + Converters.getIProjectToIdConverter().apply(project.getPrimaryProject());
    String branchName=EsiUtils.getCurrentBranch(project.getPrimaryProject()).getName();
    uriPath+="String_Node_Str" + (branchName.equals("String_Node_Str") ? "String_Node_Str" : branchName);
    Set<Element> documents=new HashSet<>();
    ArrayList<Element> viewChain=new ArrayList<>();
    viewChain.add(element);
    for (int i=0; i < viewChain.size(); i++) {
      if (StereotypesHelper.hasStereotype(viewChain.get(i),documentStereotype)) {
        documents.add(viewChain.get(i));
      }
      Set<Element> childViews=new HashSet<>();
      for (      Property prop : ((Class)viewChain.get(i)).getOwnedAttribute()) {
        if (!(prop.getType() instanceof Class)) {
          continue;
        }
        Class type=(Class)prop.getType();
        if (type == null || !(StereotypesHelper.hasStereotypeOrDerived(type,viewStereotype) || StereotypesHelper.hasStereotypeOrDerived(type,documentStereotype))) {
          continue;
        }
        childViews.add(type);
      }
      for (      Relationship relation : viewChain.get(i).get_relationshipOfRelatedElement()) {
        if (!(relation instanceof Association)) {
          continue;
        }
        Element assocEnd=((Association)relation).getMemberEnd().get(0).getOwner();
        if (!StereotypesHelper.hasStereotypeOrDerived(assocEnd,viewStereotype) && !StereotypesHelper.hasStereotypeOrDerived(assocEnd,documentStereotype)) {
          continue;
        }
        if (!childViews.contains(assocEnd) && !viewChain.contains(assocEnd)) {
          viewChain.add(assocEnd);
        }
      }
    }
    if (documents.size() > 1) {
      String label="String_Node_Str";
      List<JButton> linkButtons=new ArrayList<>();
      try {
        if (!documents.isEmpty()) {
          label="String_Node_Str" + element.getHumanName() + "String_Node_Str";
          for (          Element doc : documents) {
            if (doc.equals(element)) {
              uriPath+="String_Node_Str" + Converters.getElementToIdConverter().apply(element);
            }
 else {
              uriPath+="String_Node_Str" + Converters.getElementToIdConverter().apply(doc) + "String_Node_Str"+ Converters.getElementToIdConverter().apply(element);
            }
            JButton button=new ViewButton(doc.getHumanName(),uriBase.setPath(uriPath).build());
            linkButtons.add(button);
          }
        }
      }
 catch (      URISyntaxException se) {
        Application.getInstance().getGUILog().log("String_Node_Str" + element.getHumanName() + "String_Node_Str");
        return;
      }
      ViewEditorLinkForm viewLinkForm=new ViewEditorLinkForm(label,linkButtons);
      viewLinkForm.setVisible(true);
    }
 else {
      uriPath+="String_Node_Str" + Converters.getElementToIdConverter().apply(element) + "String_Node_Str"+ Converters.getElementToIdConverter().apply(element);
      if (Desktop.isDesktopSupported()) {
        try {
          if (documents.size() == 0) {
            Application.getInstance().getGUILog().log("String_Node_Str" + element.getHumanName() + "String_Node_Str");
          }
          Desktop.getDesktop().browse(uriBase.setPath(uriPath).build());
        }
 catch (        URISyntaxException|IOException e1) {
          Application.getInstance().getGUILog().log("String_Node_Str" + uriBase.toString());
          e1.printStackTrace();
        }
      }
 else {
        Application.getInstance().getGUILog().log("String_Node_Str" + uriBase.toString());
      }
    }
  }
}