diff --git a/papyri/gen.py b/papyri/gen.py
index 6f2f1df3..5f2f7d51 100644
--- a/papyri/gen.py
+++ b/papyri/gen.py
@@ -1541,8 +1541,10 @@ def prepare_doc_for_one_object(
         else:
             assert blob is not None
             assert api_object is not None
-
-            blob.textsignature = TextSignature(str(api_object.signature))
+            if api_object.signature is None:
+                blob.textsignature = TextSignature(None)
+            else:
+                blob.textsignature = TextSignature(str(api_object.signature))
             del blob.content["Signature"]
         self.log.debug("%r", blob.textsignature)
 
diff --git a/papyri/tests/test_gen.py b/papyri/tests/test_gen.py
index 94b6943d..d49eda8f 100644
--- a/papyri/tests/test_gen.py
+++ b/papyri/tests/test_gen.py
@@ -103,8 +103,12 @@ def test_self():
     c = Config(dry_run=True, dummy_progress=True)
     g = Gen(False, config=c)
     g.collect_package_metadata("papyri", ".", {})
-    g.collect_api_docs("papyri", {"papyri.examples:example1"})
+    g.collect_api_docs("papyri", {"papyri.examples:example1", "papyri"})
     assert g.data["papyri.examples:example1"].to_dict()["textsignature"] == {
         "type": "TextSignature",
         "value": "(pos, only, /, var, args, *, kwargs, also=None)",
     }
+    assert g.data["papyri"].to_dict()["textsignature"] == {
+        "type": "TextSignature",
+        "value": None,
+    }