Add frio.scheme pconfig value type check

- Addresses https://github.com/friendica/friendica/issues/6338#issuecomment-471118589

diff --git a/view/theme/frio/php/default.php b/view/theme/frio/php/default.php
index b9600cc22e3b991f84d882ed2b519a8e1feef641..29d7ab53c1c4e4a78ffbfc06f8bd85a467f100ad 100644 (file)
--- a/view/theme/frio/php/default.php
+++ b/view/theme/frio/php/default.php
@@ -44,7 +44,7 @@ $is_singleuser_class = $is_singleuser ? "is-singleuser" : "is-not-singleuser";
                // It makes mobile Chrome UI match Frio's top bar color.
                $uid = Profile::getThemeUid($a);
                $scheme = PConfig::get($uid, 'frio', 'scheme', PConfig::get($uid, 'frio', 'schema'));
-               if ($scheme && ($scheme != '---')) {
+               if ($scheme && is_string($scheme) && $scheme != '---') {
                        if (file_exists('view/theme/frio/scheme/' . $scheme . '.php')) {
                                $schemefile = 'view/theme/frio/scheme/' . $scheme . '.php';
                                require_once $schemefile;