Program: 32891
Project: 32891
Buggy source:
@NotNull @Override public JsonResponse handle(@NotNull final UnityOpenFilePostHandlerRequest body){
  String contentType=body.contentType;
  if (!ourSupportedContentTypes.contains(contentType)) {
    return JsonResponse.asError("String_Node_Str");
  }
  UIUtil.invokeLaterIfNeeded(new Runnable(){
    @Override public void run(){
      VirtualFile projectVirtualFile=LocalFileSystem.getInstance().findFileByPath(body.projectPath);
      if (projectVirtualFile != null) {
        Project openedProject=null;
        Project[] openProjects=ProjectManager.getInstance().getOpenProjects();
        for (        Project openProject : openProjects) {
          if (projectVirtualFile.equals(openProject.getBaseDir())) {
            openedProject=openProject;
            break;
          }
        }
        if (openedProject == null) {
          if (!new File(projectVirtualFile.getPath(),Project.DIRECTORY_STORE_FOLDER).exists()) {
            String sdkPath=SystemInfo.isMac ? body.editorPath : new File(body.editorPath).getParentFile().getParentFile().getPath();
            VirtualFile sdkFileHome=LocalFileSystem.getInstance().findFileByPath(sdkPath);
            if (sdkFileHome == null) {
              RequestFocusHttpRequestHandler.activateFrame(WindowManager.getInstance().findVisibleFrame());
              Messages.showErrorDialog("String_Node_Str" + sdkPath,"String_Node_Str");
              return;
            }
            Sdk targetSdk=null;
            List<Sdk> sdksOfType=SdkTable.getInstance().getSdksOfType(Unity3dBundleType.getInstance());
            for (            Sdk sdk : sdksOfType) {
              VirtualFile homeDirectory=sdk.getHomeDirectory();
              if (sdkFileHome.equals(homeDirectory)) {
                targetSdk=sdk;
                break;
              }
            }
            if (targetSdk == null) {
              targetSdk=SdkConfigurationUtil.createAndAddSDK(sdkPath,Unity3dBundleType.getInstance(),false);
            }
            if (targetSdk == null) {
              RequestFocusHttpRequestHandler.activateFrame(WindowManager.getInstance().findVisibleFrame());
              Messages.showErrorDialog("String_Node_Str" + sdkPath,"String_Node_Str");
              return;
            }
            Unity3dProjectImportProvider importProvider=new Unity3dProjectImportProvider();
            Unity3dProjectImportBuilder builder=(Unity3dProjectImportBuilder)importProvider.getBuilder();
            builder.setUnitySdk(targetSdk);
            AddModuleWizard wizard=ImportModuleAction.createImportWizard(null,null,projectVirtualFile,importProvider);
            if (wizard == null) {
              return;
            }
            List<Module> fromWizard=ImportModuleAction.createFromWizard(null,wizard);
            if (fromWizard.isEmpty()) {
              return;
            }
            wizard.close(DialogWrapper.OK_EXIT_CODE);
            final Project temp=fromWizard.get(0).getProject();
            activateFrame(temp,body);
            StartupManager.getInstance(temp).registerPostStartupActivity(new Runnable(){
              @Override public void run(){
                openFile(temp,body);
              }
            }
);
          }
 else {
            try {
              openedProject=ProjectManager.getInstance().loadAndOpenProject(projectVirtualFile.getPath());
            }
 catch (            Exception e) {
              Messages.showErrorDialog("String_Node_Str" + projectVirtualFile.getPath(),"String_Node_Str");
            }
            activateFrame(openedProject,body);
            openFile(openedProject,body);
          }
        }
      }
    }
  }
);
  return JsonResponse.asSuccess(null);
}

Fixed version (ground truth):
@NotNull @Override public JsonResponse handle(@NotNull final UnityOpenFilePostHandlerRequest body){
  String contentType=body.contentType;
  if (!ourSupportedContentTypes.contains(contentType)) {
    return JsonResponse.asError("String_Node_Str");
  }
  UIUtil.invokeLaterIfNeeded(new Runnable(){
    @Override public void run(){
      VirtualFile projectVirtualFile=LocalFileSystem.getInstance().findFileByPath(body.projectPath);
      if (projectVirtualFile != null) {
        Project openedProject=null;
        Project[] openProjects=ProjectManager.getInstance().getOpenProjects();
        for (        Project openProject : openProjects) {
          if (projectVirtualFile.equals(openProject.getBaseDir())) {
            openedProject=openProject;
            break;
          }
        }
        if (openedProject == null) {
          if (!new File(projectVirtualFile.getPath(),Project.DIRECTORY_STORE_FOLDER).exists()) {
            String sdkPath=SystemInfo.isMac ? body.editorPath : new File(body.editorPath).getParentFile().getParentFile().getPath();
            VirtualFile sdkFileHome=LocalFileSystem.getInstance().findFileByPath(sdkPath);
            if (sdkFileHome == null) {
              RequestFocusHttpRequestHandler.activateFrame(WindowManager.getInstance().findVisibleFrame());
              Messages.showErrorDialog("String_Node_Str" + sdkPath,"String_Node_Str");
              return;
            }
            Sdk targetSdk=null;
            List<Sdk> sdksOfType=SdkTable.getInstance().getSdksOfType(Unity3dBundleType.getInstance());
            for (            Sdk sdk : sdksOfType) {
              VirtualFile homeDirectory=sdk.getHomeDirectory();
              if (sdkFileHome.equals(homeDirectory)) {
                targetSdk=sdk;
                break;
              }
            }
            if (targetSdk == null) {
              targetSdk=SdkConfigurationUtil.createAndAddSDK(sdkPath,Unity3dBundleType.getInstance(),false);
            }
            if (targetSdk == null) {
              RequestFocusHttpRequestHandler.activateFrame(WindowManager.getInstance().findVisibleFrame());
              Messages.showErrorDialog("String_Node_Str" + sdkPath,"String_Node_Str");
              return;
            }
            Unity3dProjectImportProvider importProvider=new Unity3dProjectImportProvider();
            Unity3dProjectImportBuilder builder=(Unity3dProjectImportBuilder)importProvider.getBuilder();
            builder.setUnitySdk(targetSdk);
            AddModuleWizard wizard=ImportModuleAction.createImportWizard(null,null,projectVirtualFile,importProvider);
            if (wizard == null) {
              return;
            }
            List<Module> fromWizard=ImportModuleAction.createFromWizard(null,wizard);
            if (fromWizard.isEmpty()) {
              return;
            }
            wizard.close(DialogWrapper.OK_EXIT_CODE);
            final Project temp=fromWizard.get(0).getProject();
            activateFrame(temp,body);
            StartupManager.getInstance(temp).registerPostStartupActivity(new Runnable(){
              @Override public void run(){
                openFile(temp,body);
              }
            }
);
          }
 else {
            try {
              openedProject=ProjectManager.getInstance().loadAndOpenProject(projectVirtualFile.getPath());
            }
 catch (            Exception e) {
              Messages.showErrorDialog("String_Node_Str" + projectVirtualFile.getPath(),"String_Node_Str");
            }
            activateFrame(openedProject,body);
            openFile(openedProject,body);
          }
        }
 else {
          activateFrame(openedProject,body);
          openFile(openedProject,body);
        }
      }
    }
  }
);
  return JsonResponse.asSuccess(null);
}