diff --git a/CHANGELOG.md b/CHANGELOG.md
index c9cf6c2..e018b51 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+# 0.5.4 - 13/11/2017
+- Fix bad initialization LOG_OUTPUT_DRV_FILE variable if not defined in config file
+
 # 0.5.3 - 19/11/2017
 - Fix send parameter on event init_before and init_after
 - Added WEATHER argument in check_rain_sensor_after and check_rain_sensor_change event
diff --git a/piGarden.sh b/piGarden.sh
index e421162..0082da0 100755
--- a/piGarden.sh
+++ b/piGarden.sh
@@ -824,7 +824,7 @@ LAST_WARNING_FILE="$STATUS_DIR/last_warning"
 LAST_SUCCESS_FILE="$STATUS_DIR/last_success"
 
 if [ -z $LOG_OUTPUT_DRV_FILE ]; then
-	$LOG_OUTPUT_DRV_FILE="/dev/null"
+	LOG_OUTPUT_DRV_FILE="/dev/null"
 fi
 
 if [ -z "$EVENT_DIR" ]; then