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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"NullReferenceException when non-generic type is given type parameters","articleBody":"### Environment\r\n\r\n-   Pythonnet version: [latest git commit](https://github.com/pythonnet/pythonnet/commit/bd264cf003ca1f9727d7eaeb90ddf913e81fdad2)\r\n-   Python version: 3.7\r\n-   Operating System: Windows 10 64-bit\r\n\r\n### Details\r\n\r\nThe following incorrect Python code produces a confusing NullReferenceException, instead of a more helpful error message:\r\n```python\r\nfrom System.Collections import IList\r\nIList[bool]\r\n```\r\n\r\n-   If there was a crash, please include the traceback here.\r\n\r\n```\r\nUnhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object.\r\n   at Python.Runtime.GenericUtil.GenericByName(String ns, String name, Int32 paramCount)\r\n   at Python.Runtime.ClassBase.type_subscript(IntPtr idx)\r\n```\r\n\r\nA more helpful message would be: `System.Collections.IList is not a generic type`","author":{"url":"https://github.com/tminka","@type":"Person","name":"tminka"},"datePublished":"2020-12-17T13:31:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1325/pythonnet/issues/1325"}