diff --git a/VERSION b/VERSION
index 0c89fc9..cc868b6 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.0.0
\ No newline at end of file
+4.0.1
\ No newline at end of file
diff --git a/overlay/etc/bf/init.d/31-fr-setup-data.nu b/overlay/etc/bf/init.d/31-fr-setup-data.nu
index 4ffa724..e65afe8 100644
--- a/overlay/etc/bf/init.d/31-fr-setup-data.nu
+++ b/overlay/etc/bf/init.d/31-fr-setup-data.nu
@@ -3,6 +3,9 @@ use bf-freshrss
 bf env load
 
 def main [] {
+    # ensure source files exist
+    if (bf env FR_SRC | bf fs is_not_dir) { bf write error "FreshRSS source files cannot be found." }
+
     # get variables
     let fr_data = bf env FR_DATA
     let fr_src_data = bf env FR_SRC_DATA
diff --git a/overlay/etc/periodic/15min/fr-cron b/overlay/etc/periodic/15min/fr-cron
index 7734804..19390e3 100644
--- a/overlay/etc/periodic/15min/fr-cron
+++ b/overlay/etc/periodic/15min/fr-cron
@@ -1,7 +1,6 @@
-#!/command/with-contenv bash
+#!/bin/sh
 
 set -euo pipefail
-export BF_E=`basename ${0}`
 
 
 #======================================================================================================================
diff --git a/overlay/tmp/install b/overlay/tmp/install
index 759e01d..9402227 100644
--- a/overlay/tmp/install
+++ b/overlay/tmp/install
@@ -3,7 +3,7 @@
 use bf
 use bf-php
 
-# Absolute path to WordPress source directory
+# Absolute path to FreshRSS source directory
 const src = "/etc/bf/src/freshrss"
 
 def main [] {
diff --git a/overlay/usr/bin/bf/fr-cron b/overlay/usr/bin/bf/fr-cron
index c4eea35..2168199 100644
--- a/overlay/usr/bin/bf/fr-cron
+++ b/overlay/usr/bin/bf/fr-cron
@@ -1,7 +1,6 @@
 #!/bin/withenv sh
 
 set -euo pipefail
-export BF_E=`basename ${0}`
 
 
 #======================================================================================================================