Moodle version: 4.5.1
"Simple Clock" plugin version: Version for Moodle 2.9 onwards (2015101600)

If the plugin is installed and the "Simple Clock" block is presented in the dashboard, when a regular user (not an admin) tries to access the dashboard, the user see the following error/exception message:

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Error
Exception - Class "HTML_WRITER" not found
Debug info:
Error code: generalexceptionmessage
Stack trace:
line 161 of /blocks/simple_clock/block_simple_clock.php: Error thrown
line 337 of /blocks/moodleblock.class.php: call to block_simple_clock->get_content()
line 231 of /blocks/moodleblock.class.php: call to block_base->formatted_contents()
line 1255 of /lib/blocklib.php: call to block_base->get_content_for_output()
line 1313 of /lib/blocklib.php: call to block_manager->create_block_contents()
line 377 of /lib/blocklib.php: call to block_manager->ensure_content_created()
line 3797 of /lib/classes/output/core_renderer.php: call to block_manager->region_has_content()
line 103 of /theme/boost_union/layout/drawers.php: call to core\output\core_renderer->blocks()
line 972 of /lib/classes/output/core_renderer.php: call to include()
line 888 of /lib/classes/output/core_renderer.php: call to core\output\core_renderer->render_page_layout()
line 179 of /my/index.php: call to core\output\core_renderer->header

Is it something that could be fixed?

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Thanks