diff --git a/README.md b/README.md
index 20846a8..4aa062f 100644
--- a/README.md
+++ b/README.md
@@ -93,7 +93,7 @@ You can configure the tool via environment variables:
 
 | Variable | Type | Description |
 | ------------- | ------------- | ------------- |
-| NAME  | mandatory | Arbitrary name to give your scanner. Displayed on scanner, if multiple servers are running. |
+| NAME  | mandatory | Arbitrary (avoid spaces) name to give your scanner. Displayed on scanner, if multiple servers are running. |
 | MODEL  | mandatory | Model of your scanner (e.g., MFC-L2700DW) |
 | IPADDRESS | mandatory | IP Address of your scanner |
 | RESOLUTION | optional | DPI resolution of scan, refer to capabilities of printer on startup |
diff --git a/files/runScanner.sh b/files/runScanner.sh
index a3d82a0..7cabf45 100755
--- a/files/runScanner.sh
+++ b/files/runScanner.sh
@@ -1,5 +1,11 @@
 #!/bin/bash
 echo "setting up user & logfile:"
+
+if [[ $NAME == *" "* ]]; then
+  echo "Do not use spaces in NAME!"
+  exit -1
+fi
+
 if [[ -z ${UID} ]]; then
   UID=1000
 fi
@@ -7,11 +13,11 @@ if [[ -z ${GID} ]]; then
   GID=1000
 fi
 groupadd --gid "$GID" NAS
-adduser "$USERNAME" --uid $UID --gid "$GID" --disabled-password --force-badname --gecos ""
+adduser "$NAME" --uid $UID --gid "$GID" --disabled-password --force-badname --gecos ""
 mkdir -p /scans
 chmod 777 /scans
 touch /var/log/scanner.log
-chown "$USERNAME" /var/log/scanner.log
+chown "$NAME" /var/log/scanner.log
 env >/opt/brother/scanner/env.txt
 chmod -R 777 /opt/brother
 echo "-----"
@@ -43,8 +49,8 @@ cat /opt/brother/scanner/brscan-skey/brscan-skey.config
 echo "-----"
 
 echo "starting scanner drivers..."
-su - "$USERNAME" -c "/usr/bin/brsaneconfig4 -a name=$NAME model=$MODEL ip=$IPADDRESS"
-su - "$USERNAME" -c "/usr/bin/brscan-skey"
+su - "$NAME" -c "/usr/bin/brsaneconfig4 -a name=$NAME model=$MODEL ip=$IPADDRESS"
+su - "$NAME" -c "/usr/bin/brscan-skey"
 echo "-----"
 
 echo "setting up webserver:"