diff --git a/models/ColorSettings.php b/models/ColorSettings.php
index de804be..6eaf860 100644
--- a/models/ColorSettings.php
+++ b/models/ColorSettings.php
@@ -81,7 +81,14 @@ protected function additonalColorSaving(string $color, ?string $value): void
 
     protected function getColorFallBack(string $color): string
     {
-        $value = (new \ReflectionClass($this))->getProperty($color)->getDefaultValue();
+        // compatiblity with PHP 7.4 will be removed in next version
+        if (version_compare(phpversion(), '8.0.0', '<')) {
+            $value = (new \ReflectionProperty($this))->getDeclaringClass()->getDefaultProperties()[$color] ?? null;
+        } else {
+            // min PHP 8.0
+            $value = (new \ReflectionClass($this))->getProperty($color)->getDefaultValue();
+        }
+        
         if (empty($value)) {
             $theme_var = str_replace('_', '-', $color);
             $value = ThemeHelper::getThemeByName(self::BASE_THEME)->variable(static::PREFIX . $theme_var);
diff --git a/models/DarkColorSettings.php b/models/DarkColorSettings.php
index a876d73..1bacffa 100644
--- a/models/DarkColorSettings.php
+++ b/models/DarkColorSettings.php
@@ -114,7 +114,14 @@ public function attributeHints(): array
 
     protected function getColorFallBack(string $color): string
     {
-        $value = (new \ReflectionClass($this))->getProperty($color)->getDefaultValue();
+        // compatiblity with PHP 7.4 will be removed in next version
+        if (version_compare(phpversion(), '8.0.0', '<')) {
+            $value = (new \ReflectionProperty($this))->getDeclaringClass()->getDefaultProperties()[$color] ?? null;
+        } else {
+            // min PHP 8.0
+            $value = (new \ReflectionClass($this))->getProperty($color)->getDefaultValue();
+        }
+        
         if (empty($value)) {// only main colors can be empty!
             if (!isset($lightColors)) {
                 $lightColors = (new ColorSettings())->getColors();