diff --git a/etrago/cluster/electrical.py b/etrago/cluster/electrical.py
index ad373fc2..e92b7d34 100755
--- a/etrago/cluster/electrical.py
+++ b/etrago/cluster/electrical.py
@@ -872,6 +872,18 @@ def postprocessing(etrago, busmap, busmap_foreign, medoid_idx=None,
         line_strategies=strategies_lines(),
     )
 
+    # Drop nan values after clustering
+    clustering.network.links.min_up_time.fillna(0, inplace=True)
+    clustering.network.links.min_down_time.fillna(0, inplace=True)
+    clustering.network.links.up_time_before.fillna(0, inplace=True)
+    clustering.network.links.down_time_before.fillna(0, inplace=True)
+    # Drop nan values in timeseries after clustering
+    for c in clustering.network.iterate_components():
+        for pnl in c.attrs[
+            (c.attrs.status == "Output") & (c.attrs.varying)
+        ].index:
+            c.pnl[pnl] = pd.DataFrame(index=clustering.network.snapshots)
+
     if method == "kmedoids-dijkstra":
         for i in clustering.network.buses[
             clustering.network.buses.carrier == "AC"
@@ -1053,18 +1065,6 @@ def run_spatial_clustering(self):
         # which sets slack bus(es).
         set_control_strategies(self.network)
 
-        # Drop nan values after clustering
-        self.network.links.min_up_time.fillna(0, inplace=True)
-        self.network.links.min_down_time.fillna(0, inplace=True)
-        self.network.links.up_time_before.fillna(0, inplace=True)
-        self.network.links.down_time_before.fillna(0, inplace=True)
-        # Drop nan values in timeseries after clustering
-        for c in self.network.iterate_components():
-            for pnl in c.attrs[
-                (c.attrs.status == "Output") & (c.attrs.varying)
-            ].index:
-                c.pnl[pnl] = pd.DataFrame(index=self.network.snapshots)
-
         logger.info(
             "Network clustered to {} buses with ".format(
                 self.args["network_clustering"]["n_clusters_AC"]
diff --git a/etrago/tools/utilities.py b/etrago/tools/utilities.py
index 4adb6302..221174b1 100755
--- a/etrago/tools/utilities.py
+++ b/etrago/tools/utilities.py
@@ -2884,7 +2884,28 @@ def manual_fixes_datamodel(etrago):
     ] = 25
 
     # Set r value if missing
+    if not etrago.network.lines.loc[etrago.network.lines.r == 0, "r"].empty:
+        logger.info(
+            f"""
+            There are {len(
+                etrago.network.lines.loc[etrago.network.lines.r == 0, "r"]
+                )} lines without a resistance (r) in the data model.
+            The resistance of these lines will be automatically set to 0.0001.
+            """
+        )
+
     etrago.network.lines.loc[etrago.network.lines.r == 0, "r"] = 0.0001
+
+    if not etrago.network.transformers.loc[
+        etrago.network.transformers.r == 0, "r"
+    ].empty:
+        logger.info(
+            f"""There are {len(etrago.network.transformers.loc[
+                etrago.network.transformers.r == 0, "r"]
+                )} trafos without a resistance (r) in the data model.
+            The resistance of these trafos will be automatically set to 0.0001.
+            """
+        )
     etrago.network.transformers.loc[
         etrago.network.transformers.r == 0, "r"
     ] = 0.0001