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ContextException while assigning variable to smarty

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In Prestashop v1.7.5.1, I've just built `mycustommodule`. In a CMS Page, I'm trying to pull some data from mycustommodule via a hook. 

In the ../template/cms/page.tpl file I have:

{block name='cms_content'}
  {$cms.content nofilter}
  {if $cms.id==6}
        <h1>Here's my custom hook</h1>
        {hook h='displayCustomHook'}

In mycustommodule/mycustommodule.php, I have the hook:

public function hookCustomHook( $params ){
    $this->context->smarty->assign( array( 'myvariable' => 'test' ) );
    return $this->display(__FILE__, '/views/templates/hook/mycustommodule.tpl');

I cannot assign anything to smarty without getting this error

(1/1) ContextErrorException

Notice: Undefined property: Smarty_Internal_Undefined::$objMap

in smarty_internal_extension_handler.php line 132


I even went to github and found that line of code in the Smarty class: 

if (isset($callback) && $callback[ 0 ]->objMap | $data->_objType) {

But I feel like this is not a smarty problem -> it's something I've referenced or done or not done in the module.  I have no idea what's going wrong - The whole module is working otherwise - including adding data to a custom table in the backend using an AdminController. 

Has anyone else had this problem? WTF 

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Is dispatching the hook different than registering it? I can see my hook in the database table, and it's printing... so where would add the dispatch code? 


This is my install code:

public function install()

  if (Shop::isFeatureActive())

    if (!parent::install() || !$this->registerHook('displayCustomHook') || !$this->addTab() || !$this->addMyCustomTables()  )
        return false;

    return true;


Edited by squivo
the hook name was typed wrong: 'displayCustomHook' is the proper name (see edit history)

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Oh and also there is no difference between 

$this->context->smarty->assign( array( 'myvariable' => 'test' ) );


$this->context->smarty->assign( 'myvariable' => 'test' );

I still get the error. 


As far as I tell, my hook is registered and ready to go. 

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