diff --git a/cmds/idmap2/libidmap2/XmlParser.cpp b/cmds/idmap2/libidmap2/XmlParser.cpp
index 7c55b64..4030b83 100644
--- a/cmds/idmap2/libidmap2/XmlParser.cpp
+++ b/cmds/idmap2/libidmap2/XmlParser.cpp
@@ -98,7 +98,7 @@
 
   switch ((*value).dataType) {
     case Res_value::TYPE_STRING: {
-      if (auto str = parser_.getStrings().string8ObjectAt((*value).data)) {
+      if (auto str = parser_.getStrings().string8ObjectAt((*value).data); str.ok()) {
         return std::string(str->string());
       }
       break;