diff --git a/LiquidctlDevice.cs b/LiquidctlDevice.cs
index 7949d05..c4a1c04 100644
--- a/LiquidctlDevice.cs
+++ b/LiquidctlDevice.cs
@@ -16,7 +16,7 @@ public LiquidTemperature(LiquidctlStatusJSON output)
             }
             public void UpdateFromJSON(LiquidctlStatusJSON output)
             {
-                _value = output.status.Single(entry => entry.key == "Liquid temperature").value;
+                _value = (float)output.status.Single(entry => entry.key == "Liquid temperature").value;
             }
             public string Id => _id;
             string _id;
@@ -40,7 +40,7 @@ public PumpSpeed(LiquidctlStatusJSON output)
             }
             public void UpdateFromJSON(LiquidctlStatusJSON output)
             {
-                _value = output.status.Single(entry => entry.key == "Pump speed").value;
+                _value = (float)output.status.Single(entry => entry.key == "Pump speed").value;
             }
             public string Id => _id;
             readonly string _id;
@@ -65,7 +65,7 @@ public PumpDuty(LiquidctlStatusJSON output)
             }
             public void UpdateFromJSON(LiquidctlStatusJSON output)
             {
-                _value = output.status.Single(entry => entry.key == "Pump duty").value;
+                _value = (float)output.status.Single(entry => entry.key == "Pump duty").value;
             }
             public string Id => _id;
             string _id;
@@ -95,15 +95,15 @@ public LiquidctlDevice(LiquidctlStatusJSON output)
         {
             address = output.address;
 
-            hasPumpSpeed = output.status.Exists(entry => entry.key == "Pump duty");
+            hasPumpSpeed = output.status.Exists(entry => entry.key == "Pump duty" && !(entry.value is null));
             if (hasPumpSpeed)
                 pumpDuty = new PumpDuty(output);
 
-            hasPumpDuty = output.status.Exists(entry => entry.key == "Pump speed");
+            hasPumpDuty = output.status.Exists(entry => entry.key == "Pump speed" && !(entry.value is null));
             if (hasPumpDuty)
             pumpSpeed = new PumpSpeed(output);
 
-            hasLiquidTemperature = output.status.Exists(entry => entry.key == "Liquid temperature");
+            hasLiquidTemperature = output.status.Exists(entry => entry.key == "Liquid temperature" && !(entry.value is null));
             if (hasLiquidTemperature)
                 liquidTemperature = new LiquidTemperature(output);
         }
diff --git a/LiquidctlStatusJSON.cs b/LiquidctlStatusJSON.cs
index b8a9e6d..3886c47 100644
--- a/LiquidctlStatusJSON.cs
+++ b/LiquidctlStatusJSON.cs
@@ -6,7 +6,7 @@ public class LiquidctlStatusJSON
         public class StatusRecord
         {
             public string key { get; set; }
-            public float value { get; set; }
+            public float? value { get; set; }
             public string unit { get; set; }
         }
         public string bus { get; set; }