diff --git a/virtualsensors.py b/virtualsensors.py
index 335a634..f172702 100644
--- a/virtualsensors.py
+++ b/virtualsensors.py
@@ -25,7 +25,8 @@ class VirtualSensorBase:
             self.virtual_sensor_name = sensor_name.split('.')[1]
         self.sensor_domain = self.sensor_name.split(".")[0]
 
-        assert yaml_block ,f"{self.sensor_name} have a null Yaml block"
+        if not yaml_block:
+            self.log_error(f"{self.sensor_name} have a null Yaml block")
         self.yaml_block = yaml_block
         self.templates_library = templates_library