diff --git a/macos-guest-virtualbox.sh b/macos-guest-virtualbox.sh
index 03e5075..1a191a9 100755
--- a/macos-guest-virtualbox.sh
+++ b/macos-guest-virtualbox.sh
@@ -2,7 +2,7 @@
 # Semi-automatic installer of macOS on VirtualBox
 # (c) myspaghetti, licensed under GPL2.0 or higher
 # url: https://github.com/myspaghetti/macos-guest-virtualbox
-# version 0.84.3
+# version 0.84.4
 
 # Requirements: 40GB available storage on host
 # Dependencies: bash >= 4.3, xxd, gzip, unzip, wget, dmg2img,
@@ -772,8 +772,8 @@ echo "The second open Terminal in the virtual machine copies EFI and NVRAM files
 echo "to the target EFI partition when the installer finishes preparing."
 echo ""
 # run script concurrently, catch SIGUSR1 when installer finishes preparing
-kbstring='disks="$(diskutil list | grep -o "[0-9][^ ]* GB *disk[0-9]$" | sort -gr | grep -o disk[0-9])"; '\
-'disks=(${disks[@]}); '\
+kbstring='disks="$(diskutil list | grep -o "[0-9][^ ]* GB *disk[0-9]$" | sort -gr | grep -o disk[0-9])" && '\
+'disks=(${disks[@]}) && '\
 'printf '"'"'trap "exit 0" SIGUSR1; while true; do sleep 10; done;'"'"' | sh && '\
 'mkdir -p "/Volumes/'"${vmname}"'/tmp/mount_efi" && '\
 'mount_msdos /dev/${disks[0]}s1 "/Volumes/'"${vmname}"'/tmp/mount_efi" && '\
@@ -781,7 +781,7 @@ kbstring='disks="$(diskutil list | grep -o "[0-9][^ ]* GB *disk[0-9]$" | sort -g
 'mkdir -p "/Volumes/'"${vmname}"'/tmp/mount_efi/EFI/NVRAM/" && '\
 'cp "/Volumes/'"${macOS_release_name:0:5}-files"'/startup.nsh" "/Volumes/'"${vmname}"'/tmp/mount_efi/startup.nsh" && '\
 'cp "/Volumes/'"${macOS_release_name:0:5}-files"'/"*.bin "/Volumes/'"${vmname}"'/tmp/mount_efi/EFI/NVRAM/" && '\
-'cp "/Volumes/'"${macOS_release_name:0:5}-files"'/"*.efi "/Volumes/'"${vmname}"'/tmp/mount_efi/EFI/driver/" ; '\
+'cp "/Volumes/'"${macOS_release_name:0:5}-files"'/"*.efi "/Volumes/'"${vmname}"'/tmp/mount_efi/EFI/driver/" && '\
 'installer_pid=$(ps | grep startosinstall | cut -d '"'"' '"'"' -f 3) && '\
 'kill -SIGUSR1 ${installer_pid}'
 send_keys