diff --git a/aliases/sakuragasaki46_suou/pyproject.toml b/aliases/sakuragasaki46_suou/pyproject.toml
index 91b035a..d61a99a 100644
--- a/aliases/sakuragasaki46_suou/pyproject.toml
+++ b/aliases/sakuragasaki46_suou/pyproject.toml
@@ -10,7 +10,7 @@ license = "Apache-2.0"
 readme = "README.md"
 
 dependencies = [
-    "suou==0.7.6",
+    "suou==0.7.8",
     "itsdangerous",
     "toml",
     "pydantic",
diff --git a/src/suou/__init__.py b/src/suou/__init__.py
index 7411deb..e1bc39b 100644
--- a/src/suou/__init__.py
+++ b/src/suou/__init__.py
@@ -37,7 +37,7 @@ from .redact import redact_url_password
 from .http import WantsContentType
 from .color import chalk
 
-__version__ = "0.7.7"
+__version__ = "0.7.8"
 
 __all__ = (
     'ConfigOptions', 'ConfigParserConfigSource', 'ConfigSource', 'ConfigValue',
diff --git a/src/suou/sqlalchemy/orm.py b/src/suou/sqlalchemy/orm.py
index 37b4def..bac68d3 100644
--- a/src/suou/sqlalchemy/orm.py
+++ b/src/suou/sqlalchemy/orm.py
@@ -256,6 +256,8 @@ def unbound_fk(target: str | Column | InstrumentedAttribute, typ: _T | None = No
         target_name = target
         if typ is None:
             typ = IdType
+    else:
+        raise TypeError('target must be a str, a Column or a InstrumentedAttribute')
 
     return Column(typ, ForeignKey(target_name, ondelete='SET NULL'), nullable=True, **kwargs)
 
@@ -277,6 +279,8 @@ def bound_fk(target: str | Column | InstrumentedAttribute, typ: _T = None, **kwa
         target_name = target
         if typ is None:
             typ = IdType
+    else:
+        raise TypeError('target must be a str, a Column or a InstrumentedAttribute')
 
     return Column(typ, ForeignKey(target_name, ondelete='CASCADE'), nullable=False, **kwargs)