diff --git a/src/poetry/repositories/installed_repository.py b/src/poetry/repositories/installed_repository.py
index 47130090f40..799a9fce610 100644
--- a/src/poetry/repositories/installed_repository.py
+++ b/src/poetry/repositories/installed_repository.py
@@ -233,6 +233,9 @@ def load(cls, env: Env, with_dependencies: bool = False) -> InstalledRepository:
                 metadata.distributions(path=[entry]),
                 key=lambda d: str(d._path),
             ):
+                # fix for https://github.com/python-poetry/poetry/issues/3628
+                if distribution.metadata["name"] is None:
+                    continue
                 name = canonicalize_name(distribution.metadata["name"])
 
                 if name in seen: