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-rw-r--r--jsonschema/validators.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/jsonschema/validators.py b/jsonschema/validators.py
index 255bdcc..23ea17c 100644
--- a/jsonschema/validators.py
+++ b/jsonschema/validators.py
@@ -183,7 +183,7 @@ def create(
format_checker_arg = format_checker
specification = referencing.jsonschema.specification_with(
- dialect_id=id_of(meta_schema),
+ dialect_id=id_of(meta_schema) or "urn:unknown-dialect",
default=Specification.OPAQUE,
)