diff --git a/src/core/wee-config-file.c b/src/core/wee-config-file.c
index 014e06d71..de57a97d6 100644
--- a/src/core/wee-config-file.c
+++ b/src/core/wee-config-file.c
@@ -1748,6 +1748,9 @@ config_file_option_value_to_string (struct t_config_option *option,
     const char *ptr_value;
     int enabled, length;
 
+    if (!option)
+        return NULL;
+
     if ((default_value && !option->default_value)
         || (!default_value && !option->value))
     {