diff --git a/pymilvus/client/check.py b/pymilvus/client/check.py
index f171a8512..24f01c15f 100644
--- a/pymilvus/client/check.py
+++ b/pymilvus/client/check.py
@@ -80,7 +80,8 @@ def is_correct_date_str(param: str) -> bool:
 def is_legal_dimension(dim: Any) -> bool:
     try:
         _ = int(dim)
-    except ValueError:
+    except (TypeError, ValueError):
+        # int() raises TypeError, not ValueError, for a non-numeric type such as None
         return False
 
     return True
diff --git a/tests/unit/test_check.py b/tests/unit/test_check.py
index 15032f8fd..e1166b8de 100644
--- a/tests/unit/test_check.py
+++ b/tests/unit/test_check.py
@@ -15,6 +15,7 @@
     is_legal_ids,
     is_legal_port,
 )
+from pymilvus.exceptions import ParamError
 from pymilvus.client.utils import (
     hybridts_to_unixtime,
     mkts_from_datetime,
@@ -138,6 +139,13 @@ def test_check_param_invalid(self):
             a = {[i * j for i in range(20) for j in range(20)]}
             check_pass_param(search_data=a)
 
+    @pytest.mark.parametrize("invalid_dimension", [None, [], {}, object()])
+    def test_check_pass_param_invalid_dimension(self, invalid_dimension):
+        # int() raises TypeError rather than ValueError for these, which used to escape
+        # is_legal_dimension instead of being reported as an illegal parameter
+        with pytest.raises(ParamError):
+            check_pass_param(dimension=invalid_dimension)
+
 
 class TestGenTS:
     def test_mkts1(self):