diff --git a/scrapling/cli.py b/scrapling/cli.py
index 940c27d..7b5d703 100644
--- a/scrapling/cli.py
+++ b/scrapling/cli.py
@@ -55,11 +55,12 @@ def __ParseExtractArguments(
 ) -> Tuple[Dict[str, str], Dict[str, str], Dict[str, str], Optional[Dict[str, str]]]:
     """Parse arguments for extract command"""
     parsed_headers, parsed_cookies = _ParseHeaders(headers)
-    for key, value in _CookieParser(cookies):
-        try:
-            parsed_cookies[key] = value
-        except Exception as e:
-            raise ValueError(f"Could not parse cookies '{cookies}': {e}")
+    if cookies:
+        for key, value in _CookieParser(cookies):
+            try:
+                parsed_cookies[key] = value
+            except Exception as e:
+                raise ValueError(f"Could not parse cookies '{cookies}': {e}")
 
     parsed_json = __ParseJSONData(json)
     parsed_params = {}
diff --git a/scrapling/core/shell.py b/scrapling/core/shell.py
index 13f604a..5020194 100644
--- a/scrapling/core/shell.py
+++ b/scrapling/core/shell.py
@@ -207,11 +207,14 @@ class CurlParser:
         try:
             parsed_args, unknown = self.parser.parse_known_args(tokens)
             if unknown:
-                log.warning(f"Ignored unknown curl arguments: {unknown}")
+                raise AttributeError(f"Unknown/Unsupported curl arguments: {unknown}")
 
         except ValueError:
             return None
 
+        except AttributeError:
+            raise
+
         except Exception as e:
             log.error(
                 f"An unexpected error occurred during curl arguments parsing: {e}"