diff --git a/devicetypes/smartthings/zwave-thermostat.src/zwave-thermostat.groovy b/devicetypes/smartthings/zwave-thermostat.src/zwave-thermostat.groovy
index 0f7397b..55ab091 100644
--- a/devicetypes/smartthings/zwave-thermostat.src/zwave-thermostat.groovy
+++ b/devicetypes/smartthings/zwave-thermostat.src/zwave-thermostat.groovy
@@ -147,7 +147,7 @@ def parse(String description)
 		}
 	}
 	if (!result) {
-		return [null]
+		return []
 	}
 	return [result]
 }