diff --git a/profile.cc b/profile.cc
index 5a2ff3e..4390d23 100644
--- a/profile.cc
+++ b/profile.cc
@@ -105,6 +105,10 @@
 }
 
 string Profile::GetRpcIdentifier() {
+  if (!adaptor_.get()) {
+    // NB: This condition happens in unit tests.
+    return string();
+  }
   return adaptor_->GetRpcIdentifier();
 }