diff --git a/01_set_env.sh b/01_set_env.sh
index ca98808..17eb16f 100644
--- a/01_set_env.sh
+++ b/01_set_env.sh
@@ -1,14 +1,16 @@
 #!/bin/bash
 # shellcheck shell=bash
 
-## Set our dynamic variables in Renviron.site to be reflected by RStudio Server or Shiny Server
-exclude_vars="HOME PASSWORD RSTUDIO_VERSION BATCH_USER_CREATION"
-for file in /var/run/s6/container_environment/*
-do
-  sed -i "/^${file##*/}=/d" ${R_HOME}/etc/Renviron.site
-  regex="(^| )${file##*/}($| )"
-  [[ ! $exclude_vars =~ $regex ]] && echo "${file##*/}=$(cat $file)" >> ${R_HOME}/etc/Renviron.site || echo "skipping $file"
-done
+if [ -d "/var/run/s6/container_environment" ] ; then
+  ## Set our dynamic variables in Renviron.site to be reflected by RStudio Server or Shiny Server
+  exclude_vars="HOME PASSWORD RSTUDIO_VERSION BATCH_USER_CREATION"
+  for file in /var/run/s6/container_environment/*
+  do
+    sed -i "/^${file##*/}=/d" ${R_HOME}/etc/Renviron.site
+    regex="(^| )${file##*/}($| )"
+    [[ ! $exclude_vars =~ $regex ]] && echo "${file##*/}=$(cat $file)" >> ${R_HOME}/etc/Renviron.site || echo "skipping $file"
+  done
 
-## only file-owner (root) should read container_environment files:
-chmod 600 /var/run/s6/container_environment/*
+  ## only file-owner (root) should read container_environment files:
+  chmod 600 /var/run/s6/container_environment/*
+fi