Program: 91284
Project: 91284
Buggy source:
@Override protected void run() throws Exception {
  if (squash && ff == FastForwardMode.NO_FF)   throw die(CLIText.get().cannotCombineSquashWithNoff);
  if (strategyName != null) {
    mergeStrategy=MergeStrategy.get(strategyName);
    if (mergeStrategy == null)     throw die(MessageFormat.format(CLIText.get().unknownMergeStrategy,strategyName));
  }
  final Ref srcRef=db.getRef(ref);
  final ObjectId src=db.resolve(ref + "String_Node_Str");
  if (src == null)   throw die(MessageFormat.format(CLIText.get().refDoesNotExistOrNoCommit,ref));
  Ref oldHead=getOldHead();
  MergeResult result;
  try (Git git=new Git(db)){
    MergeCommand mergeCmd=git.merge().setStrategy(mergeStrategy).setSquash(squash).setFastForward(ff).setCommit(!noCommit);
    if (srcRef != null)     mergeCmd.include(srcRef);
 else     mergeCmd.include(src);
    if (message != null)     mergeCmd.setMessage(message);
    try {
      result=mergeCmd.call();
    }
 catch (    CheckoutConflictException e) {
      result=new MergeResult(e.getConflictingPaths());
    }
  }
 switch (result.getMergeStatus()) {
case ALREADY_UP_TO_DATE:
    if (squash)     outw.print(CLIText.get().nothingToSquash);
  outw.println(CLIText.get().alreadyUpToDate);
break;
case FAST_FORWARD:
ObjectId oldHeadId=oldHead.getObjectId();
outw.println(MessageFormat.format(CLIText.get().updating,oldHeadId.abbreviate(7).name(),result.getNewHead().abbreviate(7).name()));
outw.println(result.getMergeStatus().toString());
break;
case CHECKOUT_CONFLICT:
outw.println(CLIText.get().mergeCheckoutConflict);
for (String collidingPath : result.getCheckoutConflicts()) outw.println("String_Node_Str" + collidingPath);
outw.println(CLIText.get().mergeCheckoutFailed);
break;
case CONFLICTING:
for (String collidingPath : result.getConflicts().keySet()) outw.println(MessageFormat.format(CLIText.get().mergeConflict,collidingPath));
outw.println(CLIText.get().mergeFailed);
break;
case FAILED:
for (Map.Entry<String,MergeFailureReason> entry : result.getFailingPaths().entrySet()) switch (entry.getValue()) {
case DIRTY_WORKTREE:
case DIRTY_INDEX:
outw.println(CLIText.get().dontOverwriteLocalChanges);
outw.println("String_Node_Str" + entry.getKey());
break;
case COULD_NOT_DELETE:
outw.println(CLIText.get().cannotDeleteFile);
outw.println("String_Node_Str" + entry.getKey());
break;
}
break;
case MERGED:
String name;
if (!isMergedInto(oldHead,src)) name=mergeStrategy.getName();
 else name="String_Node_Str";
outw.println(MessageFormat.format(CLIText.get().mergeMadeBy,name));
break;
case MERGED_NOT_COMMITTED:
outw.println(CLIText.get().mergeWentWellStoppedBeforeCommitting);
break;
case MERGED_SQUASHED:
case FAST_FORWARD_SQUASHED:
case MERGED_SQUASHED_NOT_COMMITTED:
outw.println(CLIText.get().mergedSquashed);
outw.println(CLIText.get().mergeWentWellStoppedBeforeCommitting);
break;
case ABORTED:
throw die(CLIText.get().ffNotPossibleAborting);
case NOT_SUPPORTED:
outw.println(MessageFormat.format(CLIText.get().unsupportedOperation,result.toString()));
}
}

Fixed version (ground truth):
@Override protected void run() throws Exception {
  if (squash && ff == FastForwardMode.NO_FF)   throw die(CLIText.get().cannotCombineSquashWithNoff);
  if (strategyName != null) {
    mergeStrategy=MergeStrategy.get(strategyName);
    if (mergeStrategy == null)     throw die(MessageFormat.format(CLIText.get().unknownMergeStrategy,strategyName));
  }
  final Ref srcRef=db.getRef(ref);
  final ObjectId src=db.resolve(ref + "String_Node_Str");
  if (src == null)   throw die(MessageFormat.format(CLIText.get().refDoesNotExistOrNoCommit,ref));
  Ref oldHead=getOldHead();
  MergeResult result;
  try (Git git=new Git(db)){
    MergeCommand mergeCmd=git.merge().setStrategy(mergeStrategy).setSquash(squash).setFastForward(ff).setCommit(!noCommit);
    if (srcRef != null)     mergeCmd.include(srcRef);
 else     mergeCmd.include(src);
    if (message != null)     mergeCmd.setMessage(message);
    try {
      result=mergeCmd.call();
    }
 catch (    CheckoutConflictException e) {
      result=new MergeResult(e.getConflictingPaths());
    }
  }
 switch (result.getMergeStatus()) {
case ALREADY_UP_TO_DATE:
    if (squash)     outw.print(CLIText.get().nothingToSquash);
  outw.println(CLIText.get().alreadyUpToDate);
break;
case FAST_FORWARD:
ObjectId oldHeadId=oldHead.getObjectId();
if (oldHeadId != null) {
String oldId=oldHeadId.abbreviate(7).name();
String newId=result.getNewHead().abbreviate(7).name();
outw.println(MessageFormat.format(CLIText.get().updating,oldId,newId));
}
outw.println(result.getMergeStatus().toString());
break;
case CHECKOUT_CONFLICT:
outw.println(CLIText.get().mergeCheckoutConflict);
for (String collidingPath : result.getCheckoutConflicts()) outw.println("String_Node_Str" + collidingPath);
outw.println(CLIText.get().mergeCheckoutFailed);
break;
case CONFLICTING:
for (String collidingPath : result.getConflicts().keySet()) outw.println(MessageFormat.format(CLIText.get().mergeConflict,collidingPath));
outw.println(CLIText.get().mergeFailed);
break;
case FAILED:
for (Map.Entry<String,MergeFailureReason> entry : result.getFailingPaths().entrySet()) switch (entry.getValue()) {
case DIRTY_WORKTREE:
case DIRTY_INDEX:
outw.println(CLIText.get().dontOverwriteLocalChanges);
outw.println("String_Node_Str" + entry.getKey());
break;
case COULD_NOT_DELETE:
outw.println(CLIText.get().cannotDeleteFile);
outw.println("String_Node_Str" + entry.getKey());
break;
}
break;
case MERGED:
String name;
if (!isMergedInto(oldHead,src)) name=mergeStrategy.getName();
 else name="String_Node_Str";
outw.println(MessageFormat.format(CLIText.get().mergeMadeBy,name));
break;
case MERGED_NOT_COMMITTED:
outw.println(CLIText.get().mergeWentWellStoppedBeforeCommitting);
break;
case MERGED_SQUASHED:
case FAST_FORWARD_SQUASHED:
case MERGED_SQUASHED_NOT_COMMITTED:
outw.println(CLIText.get().mergedSquashed);
outw.println(CLIText.get().mergeWentWellStoppedBeforeCommitting);
break;
case ABORTED:
throw die(CLIText.get().ffNotPossibleAborting);
case NOT_SUPPORTED:
outw.println(MessageFormat.format(CLIText.get().unsupportedOperation,result.toString()));
}
}