diff --git a/vagrant/bootstrap.sh b/vagrant/bootstrap.sh
index e3638353..f64f4abb 100755
--- a/vagrant/bootstrap.sh
+++ b/vagrant/bootstrap.sh
@@ -4,6 +4,7 @@
 WEB_NAME="disroot.lan"
 WEB_ROOT="/var/www/"
 WWW_USER="www-data"
+YAML="/var/www/disroot.lan/user/config/system.yaml"
 
 # Provisioning actions
 
@@ -49,9 +50,16 @@ sudo -u "${WWW_USER}" bin/grav install
 #sudo -u www-data bin/gpm install disroot
 sudo -u "${WWW_USER}" bin/gpm install language-selector
 sudo -u "${WWW_USER}" bin/gpm install form
-sudo -u "${WWW_USER}" sed -i 's/quark/disroot/g' "${WEB_ROOT}""${WEB_NAME}"/user/config/system.yaml
-sudo -u "${WWW_USER}" ex -s -c '13i|redirect_default_route: true' -c x "${WEB_ROOT}""${WEB_NAME}"/user/config/system.yaml
-sudo -u "${WWW_USER}" echo "
+sudo -u "${WWW_USER}" sed -i 's/quark/disroot/g' "${YAML}"
+
+# Add Grav config (the second extra false should be set to true, but it creates an error in Grav ("Trying to access array offset on value of type null")
+
+if ! grep -q auto_line_breaks "${YAML}" ; then
+    sudo -u "${WWW_USER}" sed -i "s/extra:\ false/\extra:\ false\n\    auto_line_breaks:\ true\n\    auto_url_links:\ true\n\    escape_markup:\ false\n\    special_chars:\n\      \'\>\':\ \'gt\'\n\      \'\<\':\ \'lt\'/" "${YAML}"
+fi
+
+if ! grep -q languages "${YAML}" ; then
+    sudo -u "${WWW_USER}" echo "
 languages:
   supported:
     - en
@@ -59,13 +67,18 @@ languages:
     - fr
     - it
     - de
-    - ru" >> "${WEB_ROOT}""${WEB_NAME}"/user/config/system.yaml
-sudo -u "${WWW_USER}" sed -i '4d' "${WEB_ROOT}""${WEB_NAME}"/user/config/system.yaml
-sudo -u "${WWW_USER}" ex -s -c "4i|  alias: '/home'" -c x "${WEB_ROOT}""${WEB_NAME}"/user/config/system.yaml
-sudo -u "${WWW_USER}" -i 's/false/true/g' "${WEB_ROOT}""${WEB_NAME}"/user/plugins/language-selector/language-selector.yaml
+    - ru" >> "${YAML}"
+fi
+
+sudo -u "${WWW_USER}" ex -s -c "4i|  alias: '/home'" -c x "${YAML}"
+sudo -u "${WWW_USER}" sed -i '4d' "${YAML}"
+
+if ! grep -q redirect_default_route "${YAML}" ; then
+    sudo -u "${WWW_USER}" ex -s -c '16i|  redirect_default_route: true' -c x "${YAML}"
+fi
+
+sudo -u "${WWW_USER}" -i 's/false/true/g' "${YAML}"
 
-# Add Grav config (the second extra false should be set to true, but it creates an error in Grav ("Trying to access array offset on value of type null")
-sed -i "s/extra:\ false/\extra:\ false\n\    auto_line_breaks:\ true\n\    auto_url_links:\ true\n\    escape_markup:\ false\n\    special_chars:\n\      \'\>\':\ \'gt\'\n\      \'\<\':\ \'lt\'/" "${WEB_ROOT}""${WEB_NAME}"/user/config/system.yaml
 
 # Add website domain to local /etc/hosts file
 sudo sed -i "s/127.0.0.1\tlocalhost/127.0.0.1\tlocalhost $WEB_NAME/" /etc/hosts