diff --git a/adminstuds.php b/adminstuds.php
index 02fe5b58a7b3c47665b97971fc189813ddb8b347..b642d845291beab76bb5f9466eae933119315f97 100644
--- a/adminstuds.php
+++ b/adminstuds.php
@@ -154,10 +154,10 @@ if (isset($_POST['update_poll_info'])) {
             $poll->password_hash =  PasswordHasher::hash($password);
             $updated = true;
         }
-	if ($poll->password_hash == null || $poll->hidden == true){
+	if ($poll->password_hash === null || $poll->hidden === true){
 	    $poll->results_publicly_visible = false;
 	}
-        if ($resultsPubliclyVisible != $poll->results_publicly_visible && $poll->password_hash != null && $poll->hidden == false) {
+        if ($resultsPubliclyVisible !== $poll->results_publicly_visible && $poll->password_hash !== null && $poll->hidden === false) {
             $poll->results_publicly_visible = $resultsPubliclyVisible;
             $updated = true;
         }