diff --git a/admin/class-create-block-theme-admin.php b/admin/class-create-block-theme-admin.php
index 57eae62d..b7b5f354 100644
--- a/admin/class-create-block-theme-admin.php
+++ b/admin/class-create-block-theme-admin.php
@@ -353,6 +353,14 @@ function add_theme_json_variation_to_local ( $export_type, $theme ) {
 			$variation_slug = $variation_slug . '_' . $file_counter;
 		}
 
+		if ( file_exists( $variation_path . $variation_slug . '.json' ) ) {
+			$file_counter++;
+			while ( file_exists( $variation_path . $variation_slug . '_' . $file_counter . '.json' ) ) {
+				$file_counter++;
+		   	}
+			$variation_slug = $variation_slug . '_' . $file_counter;
+		}
+
 		$_GET['theme']['variation_slug'] = $variation_slug;
 
 		file_put_contents(