Program: 89015
Project: 89015
Buggy source:
public void handleBlockPlaceEvent(BlockPlaceEvent event,Block block,Player player){
  boolean allowPlacingReward=Permissions.hasRewardPlacing(player);
  if (historyProviders != null && historyProviders.getMemoryService() != null) {
    historyProviders.getMemoryService().onBlockPlaceEvent(event);
  }
  if (allowPlacingReward) {
    Configuration config=getConfiguration(player);
    if (config == null) {
      if (hasDebugger())       debugger.printDebug(this,"String_Node_Str",block);
    }
    ItemQuery retrieveKey=ItemQuery.fromExact(block);
    ItemTree placeReward=config.getSimplePlacingReward();
    if (placeReward.containsKey(retrieveKey)) {
      Action action=placeReward.get(retrieveKey);
      RewardProvider rewards=config.getRewardProvider();
      ChannelProvider channels=config.getChannelProvider();
      Collection<NamedParameter> params=config.getParameterProviders().getParameters(action,block);
      List<ResourceHolder> generated=action.generateRewards(params,rewards,random);
      if (!action.canRewardPlayer(rewards,player,generated)) {
        if (hasDebugger())         debugger.printDebug(this,"String_Node_Str",player.getName(),block.getType());
        if (!Permissions.hasUntouchable(player))         event.setCancelled(true);
      }
      Collection<ResourceHolder> result=action.rewardPlayer(rewards,player,generated);
      config.getMessageQueue().enqueue(player,action,channels.getFormatter(player,result,generated));
      if (hasDebugger())       debugger.printDebug(this,"String_Node_Str",player.getName(),StringUtils.join(result,"String_Node_Str"),block.getType());
    }
  }
}

Fixed version (ground truth):
public void handleBlockPlaceEvent(BlockPlaceEvent event,Block block,Player player){
  boolean allowPlacingReward=Permissions.hasRewardPlacing(player);
  if (historyProviders != null && historyProviders.getMemoryService() != null) {
    historyProviders.getMemoryService().onBlockPlaceEvent(event);
  }
  if (allowPlacingReward) {
    Configuration config=getConfiguration(player);
    if (config == null) {
      if (hasDebugger())       debugger.printDebug(this,"String_Node_Str",block);
      return;
    }
    ItemQuery retrieveKey=ItemQuery.fromExact(block);
    ItemTree placeReward=config.getSimplePlacingReward();
    if (placeReward.containsKey(retrieveKey)) {
      Action action=placeReward.get(retrieveKey);
      RewardProvider rewards=config.getRewardProvider();
      ChannelProvider channels=config.getChannelProvider();
      Collection<NamedParameter> params=config.getParameterProviders().getParameters(action,block);
      List<ResourceHolder> generated=action.generateRewards(params,rewards,random);
      if (!action.canRewardPlayer(rewards,player,generated)) {
        if (hasDebugger())         debugger.printDebug(this,"String_Node_Str",player.getName(),block.getType());
        if (!Permissions.hasUntouchable(player))         event.setCancelled(true);
      }
      Collection<ResourceHolder> result=action.rewardPlayer(rewards,player,generated);
      config.getMessageQueue().enqueue(player,action,channels.getFormatter(player,result,generated));
      if (hasDebugger())       debugger.printDebug(this,"String_Node_Str",player.getName(),StringUtils.join(result,"String_Node_Str"),block.getType());
    }
  }
}