diff --git a/test/pr96-recur.cfgdb b/test/pr96-recur.cfgdb
new file mode 100644
index 0000000..d43fbd0
--- /dev/null
+++ b/test/pr96-recur.cfgdb
@@ -0,0 +1,50 @@
+{
+  "comment": "Verify PR #96, where `oneof` contains nested definitions",
+  "$schema": "http://json-schema.org/draft-07/schema#",
+  "type": "object",
+  "properties": {
+    "my-color": {
+      "$ref": "#/$defs/color"
+    }
+  },
+  "$defs": {
+    "color": {
+      "oneOf": [
+        {
+          "type": "object",
+          "title": "raw-wrapper",
+          "properties": {
+            "raw": {
+              "$ref": "#/$defs/raw"
+            }
+          }
+        },
+        {
+          "type": "object",
+          "title": "preset-wrapper",
+          "properties": {
+            "preset": {
+              "$ref": "#/$defs/preset"
+            }
+          }
+        }
+      ]
+    },
+    "raw": {
+      "type": "object",
+      "properties": {
+        "value": {
+          "type": "integer"
+        }
+      }
+    },
+    "preset": {
+      "type": "object",
+      "properties": {
+        "id": {
+          "type": "string"
+        }
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/tools/dbgen.py b/tools/dbgen.py
index 86e3399..ef0cf5a 100644
--- a/tools/dbgen.py
+++ b/tools/dbgen.py
@@ -509,7 +509,8 @@ def scan(obj: Object):
                 if prop.obj in dependencies:
                     continue
                 dependencies.append(prop.obj)
-                scan(prop.obj)
+                if scan(prop.obj):
+                    return True
             return False
         return scan(self)
 
@@ -868,7 +869,7 @@ def create_object_and_property(Class) -> Property:
                 prop = parse_property(f'{path}/oneOf/{i}', union_prop, opt.get('title'), opt)
                 if not prop.obj:
                     raise ValueError(f'Union "{union_prop.name}" option type must be *object*')
-                if not prop.id or not prop.obj.typename:
+                if not prop.id or not prop.name or not prop.obj.typename:
                     raise ValueError(f'Union "{union_prop.name}" option requires title or $ref')
             if union_prop.obj.max_object_size == 0:
                 raise ValueError('Union contains only empty objects')