Avoid accessing element 0 of empty vectors.

1 files changed, 1 insertions, 1 deletions

diff --git a/searchsummary/src/vespa/searchsummary/docsummary/getdocsumargs.h b/searchsummary/src/vespa/searchsummary/docsummary/getdocsumargs.h
index 22de0a42dc6..5dbd2a05a6d 100644
--- a/searchsummary/src/vespa/searchsummary/docsummary/getdocsumargs.h
+++ b/searchsummary/src/vespa/searchsummary/docsummary/getdocsumargs.h
@@ -39,7 +39,7 @@ public:
 
     const vespalib::string & getResultClassName()      const { return _resultClassName; }
     vespalib::stringref getStackDump() const {
-        return {&_stackDump[0], _stackDump.size()};
+        return {_stackDump.data(), _stackDump.size()};
     }
 
     void dumpFeatures(bool v) { _dumpFeatures = v; }