don't use cID for custom block column names?

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In the db.xml for a custom block, to store a collectionID I added a field with
<field name="cID" type="I">
         <unsigned />
      </field>


Then in add.php I render the page selector:
$pageSelector = Loader::helper('form/page_selector');
print $pageSelector->selectPage('cID', 1);


If I then try to add this block to an area I get a error dialog with a whole lot of junk it. To fix it I just changed 'cID' to something else 'pageID' and it works fine. So maybe it's just a bad idea to use the same column names as the core files?

Then again maybe it's just some add-on I've installed, can anyone else repro this?