From f7c713226a02a8ef62cdb658439b7bd089899200 Mon Sep 17 00:00:00 2001
From: Patrik Wenger <patrik.wenger@mindclue.ch>
Date: Fri, 3 Jan 2025 17:27:10 +0100
Subject: [PATCH] maybe fix failing zconfig spec

---
 lib/cztop/config/serialization.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/cztop/config/serialization.rb b/lib/cztop/config/serialization.rb
index 4c4cb29..537765d 100644
--- a/lib/cztop/config/serialization.rb
+++ b/lib/cztop/config/serialization.rb
@@ -6,7 +6,12 @@ module CZTop::Config::Serialization
   # Serialize to a string in the ZPL format.
   # @return [String]
   def to_s
-    ffi_delegate.str_save.read_string
+    if ffi_delegate.null?
+      return ''
+    else
+      ptr = ffi_delegate.str_save
+      ptr.null? ? '' : ptr.read_string
+    end
   end