Avoid copying 0 bytes from a nullptr

1 files changed, 3 insertions, 1 deletions

diff --git a/searchlib/src/vespa/searchlib/expression/resultnodes.cpp b/searchlib/src/vespa/searchlib/expression/resultnodes.cpp
index 7fb3ab1b6cf..8f9f1b7ca06 100644
--- a/searchlib/src/vespa/searchlib/expression/resultnodes.cpp
+++ b/searchlib/src/vespa/searchlib/expression/resultnodes.cpp
@@ -438,7 +438,9 @@ void
 RawResultNode::setBuffer(const void *buf, size_t sz)
 {
     _value.resize(sz + 1);
-    memcpy(_value.data(), buf, sz);
+    if (sz > 0) {
+        memcpy(_value.data(), buf, sz);
+    }
     _value.back() = 0;
     _value.resize(sz);
 }