Do not segfault on context debugging when destroying MemObject without store ID.

diff --git a/src/MemObject.cc b/src/MemObject.cc
index 8c8c310772b38a79ef7d39ab4235050fd56ebaa8..b38cbb680578ca89676a85f85be86cfaa82aa0f9 100644 (file)
--- a/src/MemObject.cc
+++ b/src/MemObject.cc
@@ -128,7 +128,7 @@ MemObject::MemObject(): smpCollapsed(false)
 MemObject::~MemObject()
 {
     debugs(20, 3, HERE << "del MemObject " << this);
-    const Ctx ctx = ctx_enter(urlXXX());
+    const Ctx ctx = ctx_enter(hasUris() ? urlXXX() : "[unknown_ctx]");
 
 #if URL_CHECKSUM_DEBUG
     checkUrlChecksum();