diff --git a/pyproject.toml b/pyproject.toml
index 7dcf719..c8ba179 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -62,7 +62,6 @@ ignore = [
     "ISC001", # Conflicts with other rules
     "PLR2004", # Just annoying, not really useful
     "PLR0912",
-    "PLW2901",
 ]
 select = ["ALL"]
 
diff --git a/roombapy/roomba.py b/roombapy/roomba.py
index 692e21b..ef4c3b6 100755
--- a/roombapy/roomba.py
+++ b/roombapy/roomba.py
@@ -311,12 +311,14 @@ def decode_topics(self, state, prefix=None):
         to strings to avoid unicode representations
         """
         for key, value in state.items():
+            mutable_key = key
             if isinstance(value, dict):
                 if prefix is None:
                     self.decode_topics(value, key)
                 else:
                     self.decode_topics(value, prefix + "_" + key)
             else:
+                mutable_value = value
                 if isinstance(value, list):
                     newlist = []
                     for i in value:
@@ -324,37 +326,42 @@ def decode_topics(self, state, prefix=None):
                             for ki, vi in i.items():
                                 newlist.append((str(ki), vi))
                         else:
+                            val = i
                             if isinstance(i, str):
-                                i = str(i)
-                            newlist.append(i)
-                    value = newlist
+                                val = str(i)
+                            newlist.append(val)
+                    mutable_value = newlist
                 if prefix is not None:
-                    key = prefix + "_" + key
+                    mutable_key = prefix + "_" + key
                 # all data starts with this, so it's redundant
-                key = key.replace("state_reported_", "")
+                mutable_key = mutable_key.replace("state_reported_", "")
                 # save variables for drawing map
-                if key == "pose_theta":
-                    self.co_ords["theta"] = value
-                if key == "pose_point_x":  # x and y are reversed...
-                    self.co_ords["y"] = value
-                if key == "pose_point_y":
-                    self.co_ords["x"] = value
-                if key == "bin_full":
-                    self.bin_full = value
-                if key == "cleanMissionStatus_error":
+                if mutable_key == "pose_theta":
+                    self.co_ords["theta"] = mutable_value
+                if mutable_key == "pose_point_x":  # x and y are reversed...
+                    self.co_ords["y"] = mutable_value
+                if mutable_key == "pose_point_y":
+                    self.co_ords["x"] = mutable_value
+                if mutable_key == "bin_full":
+                    self.bin_full = mutable_value
+                if mutable_key == "cleanMissionStatus_error":
                     try:
-                        self.error_code = value
-                        self.error_message = ROOMBA_ERROR_MESSAGES[value]
+                        self.error_code = mutable_value
+                        self.error_message = ROOMBA_ERROR_MESSAGES[
+                            mutable_value
+                        ]
                     except KeyError as e:
                         self.log.warning(
                             "Error looking up Roomba error message: %s", e
                         )
-                        self.error_message = "Unknown Error number: %s" % value
+                        self.error_message = (
+                            "Unknown Error number: %s" % mutable_value
+                        )
                 if key == "cleanMissionStatus_phase":
                     self.previous_cleanMissionStatus_phase = (
                         self.cleanMissionStatus_phase
                     )
-                    self.cleanMissionStatus_phase = value
+                    self.cleanMissionStatus_phase = mutable_value
 
         if prefix is None:
             self.update_state_machine()