PHP - Fatal error: Unsupported operand types

[max9]

I keep getting the following error and I was wondering on how to fix?This is the second time I got this error I fixed it the first time but for some reason I cant fix it the second time.\[code\]Fatal error: Unsupported operand types on line 103\[/code\]Here is line 103.\[code\]$avg = (round($total_rating_points / $total_ratings,1));\[/code\]Here is the full code below.\[code\]function getRatingText(){ $dbc = mysqli_connect ("localhost", "root", "", "sitename"); $page = '3'; $sql1 = "SELECT COUNT(users_articles_id) FROM articles_grades WHERE users_articles_id = '$page'"; $result = mysqli_query($dbc,$sql1); if (!mysqli_query($dbc, $sql1)) { print mysqli_error($dbc); return; } $total_ratings = mysqli_fetch_array($result); $sql2 = "SELECT grade_points FROM grades JOIN articles_grades ON grades.id = articles_grades.grade_id WHERE articles_grades.users_articles_id = '$page'"; $result = mysqli_query($dbc, $sql2); if (!mysqli_query($dbc, $sql2)) { print mysqli_error($dbc); return; } while($row = mysqli_fetch_array($result)) { $trp[] = $row[0]; } $total_rating_points = array_sum($trp); if (!empty($total_rating_points) && !empty($total_ratings)){ $avg = (round($total_rating_points / $total_ratings,1)); $votes = $total_ratings; echo $avg . "/10 (" . $votes . " votes cast)"; } else { echo '(no votes cast)'; }}\[/code\]