diff --git a/src/Radio/AutoDJ/Scheduler.php b/src/Radio/AutoDJ/Scheduler.php
index 11d993f71..25f5b1744 100644
--- a/src/Radio/AutoDJ/Scheduler.php
+++ b/src/Radio/AutoDJ/Scheduler.php
@@ -406,7 +406,7 @@ final class Scheduler
         if (!empty($startDate)) {
             $startDate = CarbonImmutable::createFromFormat('Y-m-d', $startDate, $now->getTimezone());
 
-            if (false !== $startDate) {
+            if (null !== $startDate) {
                 $startDate = $startDate->setTime(0, 0);
                 if ($now->lt($startDate)) {
                     return false;
@@ -417,7 +417,7 @@ final class Scheduler
         if (!empty($endDate)) {
             $endDate = CarbonImmutable::createFromFormat('Y-m-d', $endDate, $now->getTimezone());
 
-            if (false !== $endDate) {
+            if (null !== $endDate) {
                 $endDate = $endDate->setTime(23, 59, 59);
                 if ($now->gt($endDate)) {
                     return false;
diff --git a/src/Radio/Backend/Liquidsoap/ConfigWriter.php b/src/Radio/Backend/Liquidsoap/ConfigWriter.php
index 2ed00eedb..ce3f9d210 100644
--- a/src/Radio/Backend/Liquidsoap/ConfigWriter.php
+++ b/src/Radio/Backend/Liquidsoap/ConfigWriter.php
@@ -848,7 +848,7 @@ final class ConfigWriter implements EventSubscriberInterface
             if (!empty($startDate)) {
                 $startDateObj = CarbonImmutable::createFromFormat('Y-m-d', $startDate, $tzObject);
 
-                if (false !== $startDateObj) {
+                if (null !== $startDateObj) {
                     $startDateObj = $startDateObj->setTime(0, 0);
 
                     $customFunctionBody[] = '    # ' . $startDateObj->__toString();
@@ -860,7 +860,7 @@ final class ConfigWriter implements EventSubscriberInterface
             if (!empty($endDate)) {
                 $endDateObj = CarbonImmutable::createFromFormat('Y-m-d', $endDate, $tzObject);
 
-                if (false !== $endDateObj) {
+                if (null !== $endDateObj) {
                     $endDateObj = $endDateObj->setTime(23, 59, 59);
 
                     $customFunctionBody[] = '    # ' . $endDateObj->__toString();