diff --git a/inc/css-customize/css-customize-single.php b/inc/css-customize/css-customize-single.php
index 04bf7b74..999fb3bb 100644
--- a/inc/css-customize/css-customize-single.php
+++ b/inc/css-customize/css-customize-single.php
@@ -25,11 +25,13 @@ function veu_insert_custom_css() {
 
 	if ( is_singular() || ( is_admin() && isset( $_GET['post'] ) ) ) {
 		global $post;
-		$css = veu_get_the_custom_css_single( $post );
-		if ( $css ) {
-			// HTMLエンティティをデコードし、HTMLタグとその内容を削除
-			$css = html_entity_decode( $css, ENT_QUOTES | ENT_HTML5 );
-			echo '<style type="text/css">/* ' . esc_html( veu_get_short_name() ) . ' CSS Customize Single */' . $css . '</style>';
+		if ( $post ) {
+			$css = veu_get_the_custom_css_single( $post );
+			if ( $css ) {
+				// HTMLエンティティをデコードし、HTMLタグとその内容を削除
+				$css = html_entity_decode( $css, ENT_QUOTES | ENT_HTML5 );
+				echo '<style type="text/css">/* ' . esc_html( veu_get_short_name() ) . ' CSS Customize Single */' . $css . '</style>';
+			}
 		}
 	}
 }
diff --git a/readme.txt b/readme.txt
index 59664e60..c428432e 100644
--- a/readme.txt
+++ b/readme.txt
@@ -81,6 +81,8 @@ e.g.
 
 == Changelog ==
 
+[ Bug Fix ][ CSS Customize ] Fix PHP warning on the settings screen of Contact Form 7. 
+
 = 9.100.7 =
 [ Bug fix ][ Categories/Custom taxonomies list widget ] Display order translation