diff --git a/module/netbox/inventory.py b/module/netbox/inventory.py
index 890ddbe..d48ae9e 100644
--- a/module/netbox/inventory.py
+++ b/module/netbox/inventory.py
@@ -100,12 +100,15 @@ class NetBoxInventory:
         if data_id is not None and data_id != 0:
             return self.get_by_id(object_type, nb_id=data_id)
 
-        # add slug to data if slug is primary key
-        if object_type.primary_key == "slug" and data.get("name") is not None:
-            data["slug"] = NetBoxObject.format_slug(data.get("name"))
+        # try to find object by slug
+        if "slug" in object_type.data_model.keys() and data.get("name") is not None:
+            object_slug = NetBoxObject.format_slug(data.get("name"))
+            for this_object in self.get_all_items(object_type):
+                if this_object.data.get("slug") == object_slug:
+                    return this_object
 
         # try to find by primary/secondary key
-        if data.get(object_type.primary_key) is not None:
+        elif data.get(object_type.primary_key) is not None:
             object_name_to_find = None
             for this_object in self.get_all_items(object_type):
 
diff --git a/module/netbox/object_classes.py b/module/netbox/object_classes.py
index cb98066..3f05fc5 100644
--- a/module/netbox/object_classes.py
+++ b/module/netbox/object_classes.py
@@ -468,15 +468,14 @@ class NetBoxObject:
             # value must be a string witch a certain max length
             if isinstance(defined_value_type, int):
                 if not isinstance(value, str):
-                    log.error(f"Invalid data type for '{self.__class__.__name__}.{key}' (must be str), got: '{value}'")
+                    log.error(f"Invalid data type for '{self.__class__.__name__}.{key}' (must be str), got: "
+                              f"{value} ({type(value)})")
                     continue
 
                 value = value[0:defined_value_type]
 
                 if key == "slug":
                     value = self.format_slug(text=value, max_len=defined_value_type)
-                else:
-                    value = value[0:defined_value_type]
 
             if isinstance(defined_value_type, list):
 
@@ -1230,7 +1229,7 @@ class NBPrefix(NetBoxObject):
 class NBManufacturer(NetBoxObject):
     name = "manufacturer"
     api_path = "dcim/manufacturers"
-    primary_key = "slug"
+    primary_key = "name"
     prune = False
     data_model = {
         "name": 50,