diff --git a/upgrade-v1.0x-v1.3x.sh b/upgrade-v1.0x-v1.3x.sh
index fcad9ad..f1dc2a1 100755
--- a/upgrade-v1.0x-v1.3x.sh
+++ b/upgrade-v1.0x-v1.3x.sh
@@ -7,7 +7,7 @@ CONTACT="http://www.netpower.fr/osync - ozy@netpower.fr"
 OLD_PROGRAM_VERSION="v1.0x-v1.2x"
 NEW_PROGRAM_VERSION="v1.3x"
 CONFIG_FILE_REVISION=1.3.0
-PROGRAM_BUILD=2019070502
+PROGRAM_BUILD=2019090901
 
 ## type -p does not work on platforms other than linux (bash). If if does not work, always assume output is not a zero exitcode
 if ! type "$BASH" > /dev/null; then
@@ -606,8 +606,12 @@ elif [ "$1" != "" ] && [ -f "$1" ] && [ -w "$1" ]; then
 	RewriteOldConfigFiles "$CONF_FILE"
 	AddMissingConfigOptionsAndFixBooleans "$CONF_FILE"
 	UpdateConfigHeader "$CONF_FILE"
-	RenameStateFiles "$MASTER_SYNC_DIR"
-	RenameStateFiles "$SLAVE_SYNC_DIR"
+	if [ -d "$MASTER_SYNC_DIR" ]; then
+		RenameStateFiles "$MASTER_SYNC_DIR"
+	fi
+	if [ -d "$SLAVE_SYNC_DIR" ]; then
+		RenameStateFiles "$SLAVE_SYNC_DIR"
+	fi
 	rm -f "$CONF_FILE.tmp"
 else
 	Usage