I've had this happen several different times from several different sources.
I changed the namespace and/or class and the html inherits line did not match caused this
Null values while retrieving my controls settings from tabmodulesettings
To help debug the situation there is a dnndebug.aspx file you can use. Here is a link to speerio.net that has the code for the dnndebug.aspx. Copy and paste the text from this link into a blank text file and save it as dnndebug.aspx in the root of you dnn site. Load this page in a browser and enter the path to the component and it helps you out.
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