diff --git a/F-Droid/META-INF/com/google/android/update-binary b/F-Droid/META-INF/com/google/android/update-binary
index 04c32db..5562a4a 100644
--- a/F-Droid/META-INF/com/google/android/update-binary
+++ b/F-Droid/META-INF/com/google/android/update-binary
@@ -7,7 +7,7 @@ ZIP=${3}
 ZIPDIR=$(dirname "${ZIP}")
 MODID=NanoDroid_FDroid
 
-umount /system
+umount /system &>/dev/null
 
 mkdir /dev/tmp
 unzip -o "${ZIP}" nanodroid-functions -d "/dev/tmp"
diff --git a/Full/META-INF/com/google/android/update-binary b/Full/META-INF/com/google/android/update-binary
index cbf970c..a4f1394 100644
--- a/Full/META-INF/com/google/android/update-binary
+++ b/Full/META-INF/com/google/android/update-binary
@@ -7,7 +7,7 @@ ZIP=${3}
 ZIPDIR=$(dirname "${ZIP}")
 MODID=NanoDroid
 
-umount /system
+umount /system &>/dev/null
 
 mkdir /dev/tmp
 unzip -o "${ZIP}" nanodroid-functions -d "/dev/tmp"
diff --git a/Full/nanodroid-functions b/Full/nanodroid-functions
index c4f36ba..eb8c60f 100644
--- a/Full/nanodroid-functions
+++ b/Full/nanodroid-functions
@@ -131,7 +131,7 @@ mount_partitions () {
 	SLOT=$(getprop ro.boot.slot_suffix)
 	if [ -z ${SLOT} ]; then
 		SLOT=$(getprop ro.boot.slot)
-		[ ${SLOT} = "_" ] && SLOT=
+		[ "${SLOT}" = "_" ] && SLOT=
 	fi
 
 	is_mounted /data || mount /data 2>/dev/null
diff --git a/microG/META-INF/com/google/android/update-binary b/microG/META-INF/com/google/android/update-binary
index b5dc5e6..5dcc0e9 100644
--- a/microG/META-INF/com/google/android/update-binary
+++ b/microG/META-INF/com/google/android/update-binary
@@ -7,7 +7,7 @@ ZIP=${3}
 ZIPDIR=$(dirname "${ZIP}")
 MODID=NanoDroid_microG
 
-umount /system
+umount /system &>/dev/null
 
 mkdir /dev/tmp
 unzip -o "${ZIP}" nanodroid-functions -d "/dev/tmp"