diff --git a/openlane/config/pdk_compat.py b/openlane/config/pdk_compat.py
index c106d06ac..572e088e8 100644
--- a/openlane/config/pdk_compat.py
+++ b/openlane/config/pdk_compat.py
@@ -88,7 +88,7 @@ def process_sta(key: str):
         lib = lib_raw.strip()
         lib_list = ws.split(lib)
         if new["PDK"].startswith("gf180mcu"):
-            lib_list = [l.replace("liberty", "lib") for l in lib_list]
+            lib_list = [file.replace("liberty", "lib") for file in lib_list]
         first_lib = os.path.basename(lib_list[0])[:-4]
         pvt = first_lib.split("__")[1]
         if default_pvt == "":
diff --git a/openlane/flows/cli.py b/openlane/flows/cli.py
index 694042fdc..091d719b2 100644
--- a/openlane/flows/cli.py
+++ b/openlane/flows/cli.py
@@ -153,6 +153,10 @@ def pdk_scl_cb(
                         pdk_family = family.name
                         break
 
+            if pdk_family is None:
+                err(f"Could not resolve the PDK '{ctx.params['pdk']}'.")
+                ctx.exit(1)
+
             version = volare.fetch(
                 volare_home,
                 pdk_family,