Merge pull request #287 from woocommerce/fix/async-attribute-tags

Fix script tag replacer

includes/class-wc-google-analytics.php

@@ -722,6 +722,13 @@ public function async_script_loader_tags( $tag, $handle, $src ) {
 			return $tag;
 		}
 
-		return str_replace( '<script src', '<script async src', $tag );
+		// Check if the script has the async attribute already. If so, don't add it again.
+		$has_async_tag = preg_match( '/\basync\b/', $tag );
+		if ( ! empty( $has_async_tag ) ) {
+			return $tag;
+		}
+
+		// Add the async attribute
+		return str_replace( ' src', ' async src', $tag );
 	}
 }