diff --git a/.gitignore b/.gitignore
index 8d3d30d..9c376d5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -133,6 +133,6 @@ dmypy.json
 # vscode settings
 .vscode/
 
-src/_bo4e_python_generator_version.py
+src/_bo4e_generator_version.py
 
 unittests/output
diff --git a/src/bo4e_generator/schema.py b/src/bo4e_generator/schema.py
index 1858b49..83161a7 100644
--- a/src/bo4e_generator/schema.py
+++ b/src/bo4e_generator/schema.py
@@ -75,4 +75,7 @@ def get_version(namespace: dict[str, SchemaMetadata]) -> str:
     Get the version of the bo4e schemas.
     """
     # The chosen class is arbitrary. All bo's and com's should contain the same version information.
-    return namespace["Angebot"].schema_parsed["properties"]["_version"]["default"]
+    try:
+        return namespace["Angebot"].schema_parsed["properties"]["_version"]["default"]
+    except KeyError:
+        return "unknown"