Program: 136003
Project: 136003
Buggy source:
public Object execute(ExecutionEvent event) throws ExecutionException {
  ISelection selection=UIHelper.getActivePage().getSelection();
  IEditorPart editor=HandlerUtil.getActiveEditor(event);
  if (selection instanceof ITextSelection) {
    ITextSelection textSelection=(ITextSelection)selection;
    IEditorInput edInput=editor.getEditorInput();
    if (edInput instanceof FileEditorInput) {
      String moduleName=ResourceHelper.getModuleName(((FileEditorInput)edInput).getFile());
      FileDocumentProvider fdp=new FileDocumentProvider();
      try {
        fdp.connect(edInput);
        document=fdp.getDocument(edInput);
      }
 catch (      CoreException e) {
        ProverUIActivator.logError("String_Node_Str" + moduleName,e);
      }
 finally {
        fdp.disconnect(edInput);
      }
      HashMap params=new HashMap();
      ParseResult parseResult=ParseResultBroadcaster.getParseResultBroadcaster().getParseResult(moduleName);
      if (parseResult != null) {
        SpecObj specObj=parseResult.getSpecObj();
        if (specObj == null) {
          return null;
        }
        Assert.isNotNull(specObj.getExternalModuleTable());
        ModuleNode moduleNode=specObj.getExternalModuleTable().getModuleNode(UniqueString.uniqueStringOf(moduleName));
        if (moduleNode == null) {
          return null;
        }
        TheoremNode[] theorems=moduleNode.getTheorems();
        TheoremNode stepWithCaret=null;
        for (int i=0; i < theorems.length; i++) {
          TheoremNode theoremNode=theorems[i];
          if (theoremNode.getLocation().source().equals(moduleName)) {
            TheoremNode step=getStepWithCaret(theoremNode,textSelection.getOffset() + textSelection.getLength());
            if (step != null) {
              stepWithCaret=step;
              break;
            }
          }
        }
        params.put(CheckProofHandler.PARAM_MODULE_NAME,moduleName);
        if (stepWithCaret != null) {
          ProofNode proof=stepWithCaret.getProof();
          if (proof != null) {
            params.put(CheckProofHandler.PARAM_BEGIN_LINE,"String_Node_Str" + stepWithCaret.getLocation().beginLine());
            params.put(CheckProofHandler.PARAM_BEGIN_COLUMN,"String_Node_Str" + stepWithCaret.getLocation().beginColumn());
            params.put(CheckProofHandler.PARAM_END_LINE,"String_Node_Str" + proof.getLocation().endLine());
            params.put(CheckProofHandler.PARAM_END_COLUMN,"String_Node_Str" + proof.getLocation().endColumn());
          }
        }
 else {
          try {
            params.put(CheckProofHandler.PARAM_BEGIN_LINE,"String_Node_Str" + 1);
            params.put(CheckProofHandler.PARAM_BEGIN_COLUMN,"String_Node_Str" + 1);
            params.put(CheckProofHandler.PARAM_END_LINE,"String_Node_Str" + document.getNumberOfLines());
            params.put(CheckProofHandler.PARAM_END_COLUMN,"String_Node_Str" + document.getLineInformation(document.getNumberOfLines() - 1).getLength());
          }
 catch (          BadLocationException e) {
            ProverUIActivator.logError("String_Node_Str" + moduleName,e);
            return null;
          }
        }
        UIHelper.runCommand(CheckProofHandler.COMMAND_ID,params);
      }
    }
  }
  return null;
}

Fixed version (ground truth):
public Object execute(ExecutionEvent event) throws ExecutionException {
  IEditorPart editor=HandlerUtil.getActiveEditor(event);
  Assert.isNotNull(editor,"String_Node_Str");
  ISelectionProvider selectionProvider=(ISelectionProvider)editor.getAdapter(ISelectionProvider.class);
  Assert.isNotNull(selectionProvider,"String_Node_Str");
  ISelection selection=selectionProvider.getSelection();
  if (selection instanceof ITextSelection) {
    ITextSelection textSelection=(ITextSelection)selection;
    IEditorInput edInput=editor.getEditorInput();
    if (edInput instanceof FileEditorInput) {
      String moduleName=ResourceHelper.getModuleName(((FileEditorInput)edInput).getFile());
      FileDocumentProvider fdp=new FileDocumentProvider();
      try {
        fdp.connect(edInput);
        document=fdp.getDocument(edInput);
      }
 catch (      CoreException e) {
        ProverUIActivator.logError("String_Node_Str" + moduleName,e);
      }
 finally {
        fdp.disconnect(edInput);
      }
      HashMap params=new HashMap();
      ParseResult parseResult=ParseResultBroadcaster.getParseResultBroadcaster().getParseResult(moduleName);
      if (parseResult != null) {
        SpecObj specObj=parseResult.getSpecObj();
        if (specObj == null) {
          return null;
        }
        Assert.isNotNull(specObj.getExternalModuleTable());
        ModuleNode moduleNode=specObj.getExternalModuleTable().getModuleNode(UniqueString.uniqueStringOf(moduleName));
        if (moduleNode == null) {
          return null;
        }
        TheoremNode[] theorems=moduleNode.getTheorems();
        TheoremNode stepWithCaret=null;
        for (int i=0; i < theorems.length; i++) {
          TheoremNode theoremNode=theorems[i];
          if (theoremNode.getLocation().source().equals(moduleName)) {
            TheoremNode step=getStepWithCaret(theoremNode,textSelection.getOffset() + textSelection.getLength());
            if (step != null) {
              stepWithCaret=step;
              break;
            }
          }
        }
        params.put(CheckProofHandler.PARAM_MODULE_NAME,moduleName);
        if (stepWithCaret != null) {
          ProofNode proof=stepWithCaret.getProof();
          if (proof != null) {
            params.put(CheckProofHandler.PARAM_BEGIN_LINE,"String_Node_Str" + stepWithCaret.getLocation().beginLine());
            params.put(CheckProofHandler.PARAM_BEGIN_COLUMN,"String_Node_Str" + stepWithCaret.getLocation().beginColumn());
            params.put(CheckProofHandler.PARAM_END_LINE,"String_Node_Str" + proof.getLocation().endLine());
            params.put(CheckProofHandler.PARAM_END_COLUMN,"String_Node_Str" + proof.getLocation().endColumn());
          }
        }
 else {
          try {
            params.put(CheckProofHandler.PARAM_BEGIN_LINE,"String_Node_Str" + 1);
            params.put(CheckProofHandler.PARAM_BEGIN_COLUMN,"String_Node_Str" + 1);
            params.put(CheckProofHandler.PARAM_END_LINE,"String_Node_Str" + document.getNumberOfLines());
            params.put(CheckProofHandler.PARAM_END_COLUMN,"String_Node_Str" + document.getLineInformation(document.getNumberOfLines() - 1).getLength());
          }
 catch (          BadLocationException e) {
            ProverUIActivator.logError("String_Node_Str" + moduleName,e);
            return null;
          }
        }
        UIHelper.runCommand(CheckProofHandler.COMMAND_ID,params);
      }
    }
  }
  return null;
}