Program: 62554
Project: 62554
Buggy source:
@Override public void handleCommand(ChannelUID channelUID,Command command){
  if (state == null) {
    logger.debug("String_Node_Str");
    return;
  }
switch (channelUID.getId()) {
case MilightBindingConstants.CHANNEL_COLOR:
{
      if (command instanceof HSBType) {
        HSBType hsb=(HSBType)command;
        if (hsb.getSaturation().intValue() < 50) {
          state.setWhiteMode();
        }
 else {
          state.setColor(hsb.getHue().intValue());
        }
        state.setBrightness(hsb.getBrightness().intValue());
      }
 else       if (command instanceof OnOffType) {
        OnOffType hsb=(OnOffType)command;
        if (hsb == OnOffType.OFF) {
          state.setOff();
        }
 else {
          state.setOn();
        }
      }
 else       if (command instanceof PercentType) {
        PercentType p=(PercentType)command;
        state.setBrightness(p.intValue());
      }
      break;
    }
case MilightBindingConstants.CHANNEL_NIGHTMODE:
{
    state.setNightMode();
    break;
  }
case MilightBindingConstants.CHANNEL_BRIGHTNESS:
{
  if (command instanceof OnOffType) {
    OnOffType s=(OnOffType)command;
    if (s == OnOffType.OFF) {
      state.setOff();
    }
 else {
      state.setOn();
    }
  }
 else   if (command instanceof PercentType) {
    PercentType p=(PercentType)command;
    state.setBrightness(p.intValue());
  }
  break;
}
case MilightBindingConstants.CHANNEL_TEMP:
{
DecimalType d=(DecimalType)command;
state.setColorTemperature(d.intValue());
break;
}
case MilightBindingConstants.CHANNEL_SPEED:
{
DecimalType d=(DecimalType)command;
state.setDiscoSpeed(d.intValue());
break;
}
case MilightBindingConstants.CHANNEL_MODE:
{
StringType d=(StringType)command;
state.setDiscoMode(Integer.valueOf(d.toString()));
break;
}
default :
logger.error("String_Node_Str" + channelUID.getId());
}
}

Fixed version (ground truth):
@Override public void handleCommand(ChannelUID channelUID,Command command){
  if (state == null) {
    logger.debug("String_Node_Str");
    return;
  }
switch (channelUID.getId()) {
case MilightBindingConstants.CHANNEL_COLOR:
{
      if (command instanceof HSBType) {
        HSBType hsb=(HSBType)command;
        if (hsb.getSaturation().intValue() < 50) {
          state.setWhiteMode();
        }
 else {
          state.setColor(hsb.getHue().intValue());
        }
        state.setBrightness(hsb.getBrightness().intValue());
      }
 else       if (command instanceof OnOffType) {
        OnOffType hsb=(OnOffType)command;
        if (hsb == OnOffType.OFF) {
          state.setOff();
        }
 else {
          state.setOn();
        }
      }
 else       if (command instanceof PercentType) {
        PercentType p=(PercentType)command;
        state.setBrightness(p.intValue());
      }
      break;
    }
case MilightBindingConstants.CHANNEL_NIGHTMODE:
{
    state.setNightMode();
    break;
  }
case MilightBindingConstants.CHANNEL_BRIGHTNESS:
{
  if (command instanceof OnOffType) {
    OnOffType s=(OnOffType)command;
    if (s == OnOffType.OFF) {
      state.setOff();
    }
 else {
      state.setOn();
    }
  }
 else   if (command instanceof PercentType) {
    PercentType p=(PercentType)command;
    state.setBrightness(p.intValue());
  }
  break;
}
case MilightBindingConstants.CHANNEL_TEMP:
{
if (command instanceof IncreaseDecreaseType) {
  IncreaseDecreaseType id=(IncreaseDecreaseType)command;
  if (id == IncreaseDecreaseType.INCREASE) {
    state.warmer();
  }
 else   if (id == IncreaseDecreaseType.DECREASE) {
    state.cooler();
  }
}
 else if (command instanceof DecimalType) {
  DecimalType d=(DecimalType)command;
  state.setColorTemperature(d.intValue());
}
break;
}
case MilightBindingConstants.CHANNEL_SPEED:
{
if (command instanceof IncreaseDecreaseType) {
IncreaseDecreaseType id=(IncreaseDecreaseType)command;
if (id == IncreaseDecreaseType.INCREASE) {
  state.increaseSpeed();
}
 else if (id == IncreaseDecreaseType.DECREASE) {
  state.decreaseSpeed();
}
}
 else if (command instanceof DecimalType) {
DecimalType d=(DecimalType)command;
state.setDiscoSpeed(d.intValue());
}
break;
}
case MilightBindingConstants.CHANNEL_MODE:
{
if (command instanceof IncreaseDecreaseType) {
IncreaseDecreaseType id=(IncreaseDecreaseType)command;
if (id == IncreaseDecreaseType.INCREASE) {
state.nextDiscoMode();
}
 else if (id == IncreaseDecreaseType.DECREASE) {
state.previousDiscoMode();
}
}
 else if (command instanceof DecimalType) {
DecimalType d=(DecimalType)command;
state.setDiscoMode(d.intValue());
}
 else if (command instanceof StringType) {
StringType d=(StringType)command;
state.setDiscoMode(Integer.valueOf(d.toString()));
}
break;
}
default :
logger.error("String_Node_Str" + channelUID.getId());
}
}