Context set block on page breaks layout

When we try to use the context module:
Context: in this case adding a standard block to a certain node type and setting a condition to put it to the "content" region of that certaing node: it generates the following error:

Error: Call to a member function getRegion() on null in bulma_preprocess_block() (line 209 of /Applications/MAMP/htdocs/website/themes/bulma/bulma.theme)

line 209 is here in the bulma.theme.
// Set a region variable for use in templates.
$block = Block::load($variables['elements']['#id']);
$variables['region'] = $block->getRegion();
}