diff --git a/internal/php7/php7.go b/internal/php7/php7.go
index e67e095..03984ad 100644
--- a/internal/php7/php7.go
+++ b/internal/php7/php7.go
@@ -6476,7 +6476,7 @@ yydefault:
 		yyDollar = yyS[yypt-0 : yypt+1]
 		// line internal/php7/php7.y:3877
 		{
-			yyVAL.node = nil
+			yyVAL.node = &ast.ArgumentList{}
 		}
 	case 398:
 		yyDollar = yyS[yypt-1 : yypt+1]
diff --git a/internal/php7/php7.y b/internal/php7/php7.y
index afa2f69..9b99da7 100644
--- a/internal/php7/php7.y
+++ b/internal/php7/php7.y
@@ -3875,7 +3875,7 @@ backticks_expr:
 ctor_arguments:
         /* empty */
             {
-                $$ = nil
+                $$ = &ast.ArgumentList{}
             }
     |   argument_list
             {