diff --git a/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java b/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java
index d677ad8..c1dbbe9 100644
--- a/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java
+++ b/src/src/main/java/com/my/graphiteDigesterBg/resource/ResHeatingTubeRackSlotManager.java
@@ -52,8 +52,12 @@ public class ResHeatingTubeRackSlotManager extends DiResourceManagerBase {
     public void refreshSlotTemperature() {
         var registers = this.getDevice().getRegisters();
         for (ResHeatingTubeRackSlot slot : this.slots) {
-            slot.temperature = registers.getValue("HeatingPlateSlotTemperature" + slot.index);
-            LOG.info("[Heating Slot {}] temperature: {}", slot.index, slot.temperature);
+            try {
+                slot.temperature = registers.getValue("HeatingPlateSlotTemperature" + slot.index);
+                LOG.info("[Heating Slot {}] temperature: {}", slot.index, slot.temperature);
+            } catch (Exception e) {
+                LOG.error("Failed to get temperature for slot {}", slot.index, e);
+            }
         }
     }
 
@@ -77,7 +81,7 @@ public class ResHeatingTubeRackSlotManager extends DiResourceManagerBase {
         }
         throw new RuntimeException("暂无空闲试管架位置");
     }
-
+    
     // get slot by index
     public ResHeatingTubeRackSlot getSlotByIndex( Integer index ) {
         return this.slots.get(index);
@@ -91,7 +95,7 @@ public class ResHeatingTubeRackSlotManager extends DiResourceManagerBase {
     // get slot at liquid plate
     public ResHeatingTubeRackSlot getSlotAtLiquidPlate() {
         for (ResHeatingTubeRackSlot slot : this.slots) {
-            if (slot.rackPosition.equals(ResHeatingTubeRackSlot.LOCATION_LIQUID_PLATE)) {
+            if (ResHeatingTubeRackSlot.LOCATION_LIQUID_PLATE.equals(slot.rackPosition)) {
                 return slot;
             }
         }