I'm seeing the same PHP warnings in my log but I don't think there are any front end error messages:

PHP Warning:  Invalid argument supplied for foreach() in /my_home/public_html/wp-content/plugins/wpforo/wpforo.php on line 141 

This is the code and the foreach() it mentions:

public function phrases(){
		if($this->general_options){
				$phrases = $this->phrase->get_phrases( array( 'langid' => $this->general_options['lang'] ) );
				foreach($phrases as $phrase){
					$this->phrases[addslashes(strtolower($phrase['phrase_key']))] = $phrase['phrase_value'];
				}
			}
	}

It's not urgent as there are no external symptoms, but what can I do to resolve the error? Thanks!