diff --git a/packages/helpermodules/setdata.py b/packages/helpermodules/setdata.py
index 455a8e4ad7..dab1ad0b8f 100644
--- a/packages/helpermodules/setdata.py
+++ b/packages/helpermodules/setdata.py
@@ -491,8 +491,9 @@ def process_chargepoint_topic(self, msg: mqtt.MQTTMessage):
                     self._validate_value(msg, bool)
                 elif "/set/autolock_state" in msg.topic:
                     self._validate_value(msg, int, [(0, 4)])
-                elif ("/set/rfid" in msg.topic or
-                        "/set/plug_time" in msg.topic):
+                elif "/set/rfid" in msg.topic:
+                    self._validate_value(msg, str)
+                elif "/set/plug_time" in msg.topic:
                     self._validate_value(msg, float)
                 elif "/set/ocpp_transaction_id" in msg.topic:
                     self._validate_value(msg, int)