diff --git a/app/Console/Commands/SoilMonitoringLogFixCommand.php b/app/Console/Commands/SoilMonitoringLogFixCommand.php
index b04bdd4..3006454 100644
--- a/app/Console/Commands/SoilMonitoringLogFixCommand.php
+++ b/app/Console/Commands/SoilMonitoringLogFixCommand.php
@@ -45,7 +45,7 @@ class SoilMonitoringLogFixCommand extends Command
             ->get();
 
         foreach ($devices as $device) {
-            if (is_null(SoilMonitoringLog::where('device_id', $device->id)->where('monitored_at', $time)->first())) {
+            if (SoilMonitoringLog::where('device_id', $device->id)->where('monitored_at', $time)->first()) {
                 continue;
             }
 
diff --git a/app/Console/Commands/WaterQualityMonitoringLogFixCommand.php b/app/Console/Commands/WaterQualityMonitoringLogFixCommand.php
index e041fd8..5fb2c20 100644
--- a/app/Console/Commands/WaterQualityMonitoringLogFixCommand.php
+++ b/app/Console/Commands/WaterQualityMonitoringLogFixCommand.php
@@ -45,7 +45,7 @@ class WaterQualityMonitoringLogFixCommand extends Command
             ->get();
 
         foreach ($devices as $device) {
-            if (is_null(WaterQualityMonitoringLog::where('device_id', $device->id)->where('monitored_at', $time)->first())) {
+            if (WaterQualityMonitoringLog::where('device_id', $device->id)->where('monitored_at', $time)->first()) {
                 continue;
             }