diff --git a/web/app/models/UOJContext.php b/web/app/models/UOJContext.php
index 769a719..a6c6915 100644
--- a/web/app/models/UOJContext.php
+++ b/web/app/models/UOJContext.php
@@ -66,7 +66,8 @@ class UOJContext {
 		if ($domain === null) {
 			$domain = UOJConfig::$data['web']['main']['host'];
 		}
-		$domain = array_shift(explode(':', $domain));
+		$domain = explode(':', $domain);
+		$domain = array_shift($domain);
 		if (validateIP($domain) || $domain === 'localhost') {
 			$domain = '';
 		} else {
diff --git a/web/install.sh b/web/install.sh
index 8f041b2..b5c191b 100644
--- a/web/install.sh
+++ b/web/install.sh
@@ -10,13 +10,15 @@ _judger_socket_password_=_judger_socket_password_
 
 getAptPackage(){
     printf "\n\n==> Getting environment packages\n"
-    #Update apt sources and install
+    # Update apt sources and install
     export DEBIAN_FRONTEND=noninteractive
     dpkg -s gnupg 2>/dev/null || (apt-get update && apt-get install -y gnupg)
     echo "deb http://ppa.launchpad.net/stesie/libv8/ubuntu bionic main" | tee /etc/apt/sources.list.d/stesie-libv8.list && apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D858A0DF
-    apt-get update && apt-get install -y vim ntp zip unzip curl wget apache2 libapache2-mod-xsendfile libapache2-mod-php php php-dev php-pear php-zip php-mysql php-mbstring php-gd php-intl php-xsl g++ make re2c libv8-7.5-dev libyaml-dev
+    apt-get update && apt-get install -y git vim ntp zip unzip curl wget apache2 libapache2-mod-xsendfile libapache2-mod-php php php-dev php-pear php-zip php-mysql php-mbstring php-gd php-intl php-xsl g++ make re2c libv8-7.5-dev libyaml-dev
     # Install PHP extensions
-    printf "/opt/libv8-7.5\n\n" | pecl install v8js yaml
+    yes | pecl install yaml
+    git clone https://github.com/phpv8/v8js.git --depth=1 /tmp/pear/download/v8js-master && cd /tmp/pear/download/v8js-master
+    phpize && ./configure --with-php-config=/usr/bin/php-config --with-v8js=/opt/libv8-7.5 && make install && cd -
 }
 
 setLAMPConf(){
@@ -45,7 +47,7 @@ UOJEOF
     a2enmod rewrite headers && sed -i -e '172s/AllowOverride None/AllowOverride All/' /etc/apache2/apache2.conf
     #Create UOJ session save dir and make PHP extensions available
     mkdir --mode=733 /var/lib/php/uoj_sessions && chmod +t /var/lib/php/uoj_sessions
-    sed -i -e '865a\extension=v8js.so\nextension=yaml.so' /etc/php/7.2/apache2/php.ini
+    sed -i -e '912a\extension=v8js.so\nextension=yaml.so' /etc/php/7.4/apache2/php.ini
 }
 
 setWebConf(){