diff --git a/config.go b/config.go
index ab607dd..e7cc33a 100644
--- a/config.go
+++ b/config.go
@@ -35,7 +35,7 @@ func loadConfig() *config {
 
 	if fileExists(pathConfigFile) {
 		err := readProperties(pathConfigFile, func(key string, value string) {
-			switch strings.ToUpper(key) {
+			switch key {
 			case confTTYnumber:
 				c.tty = parseTTY(value, "0")
 			case confSwitchTTY:
@@ -43,7 +43,7 @@ func loadConfig() *config {
 			case confPrintIssue:
 				c.printIssue = parseBool(value, "true")
 			case confDefaultUser:
-				c.defaultUser = parseDefaultUser(value, "")
+				c.defaultUser = sanitizeValue(value, "")
 			case confAutologin:
 				c.autologin = parseBool(value, "false")
 			case confLang:
@@ -83,11 +83,6 @@ func parseBool(strBool string, defaultValue string) bool {
 	return val
 }
 
-// Parse default user.
-func parseDefaultUser(defaultUser string, defaultValue string) string {
-	return sanitizeValue(defaultUser, defaultValue)
-}
-
 // Sanitize value.
 func sanitizeValue(value string, defaultValue string) string {
 	if value == "" {
diff --git a/desktop.go b/desktop.go
index 7d3c3dd..23c9d3a 100644
--- a/desktop.go
+++ b/desktop.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"bufio"
-	"errors"
 	"fmt"
 	"io/ioutil"
 	"log"
@@ -62,7 +61,7 @@ type lastSession struct {
 func selectDesktop(uid int) *desktop {
 	desktops := listAllDesktops()
 	if len(desktops) == 0 {
-		handleErr(errors.New("Not found any installed desktop."))
+		handleStrErr("Not found any installed desktop.")
 	}
 
 	lastSessions := loadLastSessions()
@@ -148,7 +147,7 @@ func getDesktop(path string, env enEnvironment) *desktop {
 	}
 
 	readProperties(path, func(key string, value string) {
-		switch strings.ToUpper(key) {
+		switch key {
 		case desktopName:
 			d.name = value
 		case desktopExec:
@@ -169,7 +168,7 @@ func loadUserDesktop(homeDir string) (*desktop, string) {
 		d := desktop{isUser: true, path: confFile, env: Xorg}
 
 		err := readProperties(confFile, func(key string, value string) {
-			switch strings.ToUpper(key) {
+			switch key {
 			case confCommand:
 				d.exec = sanitizeValue(value, "")
 			case confEnvironment:
diff --git a/login.go b/login.go
index 27efe4b..70e20cd 100644
--- a/login.go
+++ b/login.go
@@ -222,7 +222,7 @@ func xorg(usr *sysuser, d *desktop, conf *config) {
 	xorg.Env = append(os.Environ())
 	xorg.Start()
 	if xorg.Process == nil {
-		handleErr(errors.New("Xorg is not running"))
+		handleStrErr("Xorg is not running")
 	}
 	log.Print("Started Xorg")
 
diff --git a/utils.go b/utils.go
index 2fbc7b9..e0c202f 100644
--- a/utils.go
+++ b/utils.go
@@ -36,7 +36,7 @@ func readProperties(filePath string, method propertyFunc) error {
 			if strings.Index(value, "#") >= 0 {
 				value = value[:strings.Index(value, "#")]
 			}
-			key = strings.TrimSpace(key)
+			key = strings.ToUpper(strings.TrimSpace(key))
 			value = strings.TrimSpace(value)
 			method(key, value)
 		}
@@ -50,6 +50,13 @@ func fileExists(path string) bool {
 	return err == nil
 }
 
+// Handles error passed as string and calls handleErr function.
+func handleStrErr(err string) {
+	if err != "" {
+		handleErr(errors.New(err))
+	}
+}
+
 // If error is not nil, otherwise it prints error, waits for user input and then exits the program.
 func handleErr(err error) {
 	if err != nil {