diff --git a/projects/plugins/wpcomsh/changelog/fix-warnings-on-any-theme-using-customizer-colors b/projects/plugins/wpcomsh/changelog/fix-warnings-on-any-theme-using-customizer-colors
new file mode 100644
index 0000000000000..da207bfd8be38
--- /dev/null
+++ b/projects/plugins/wpcomsh/changelog/fix-warnings-on-any-theme-using-customizer-colors
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Fix: Undefined array key warnings on any customizer theme with colors.
diff --git a/projects/plugins/wpcomsh/custom-colors/colors.php b/projects/plugins/wpcomsh/custom-colors/colors.php
index b2a4405482e8d..15f56c8ee244c 100644
--- a/projects/plugins/wpcomsh/custom-colors/colors.php
+++ b/projects/plugins/wpcomsh/custom-colors/colors.php
@@ -1421,8 +1421,12 @@ public static function override_themecolors() {
 
 		$colors = $opts['colors'];
 
-		$colors['border'] = $colors['fg1'];
-		$colors['url']    = $colors['link'];
+		if ( isset( $colors['fg1'] ) ) {
+			$colors['border'] = $colors['fg1'];
+		}
+		if ( isset( $colors['link'] ) ) {
+			$colors['url'] = $colors['link'];
+		}
 		if ( isset( $colors['txt'] ) ) {
 			$colors['text'] = $colors['txt'];
 		}