--- old/src/share/vm/code/relocInfo.cpp	2017-05-23 10:05:38.483930973 +0200
+++ new/src/share/vm/code/relocInfo.cpp	2017-05-23 10:05:38.391930968 +0200
@@ -129,9 +129,9 @@
   if (nm == NULL && begin != NULL) {
     // allow nmethod to be deduced from beginning address
     CodeBlob* cb = CodeCache::find_blob(begin);
-    nm = cb->as_compiled_method_or_null();
+    nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
   }
-  assert(nm != NULL, "must be able to deduce nmethod from other arguments");
+  guarantee(nm != NULL, "must be able to deduce nmethod from other arguments");
 
   _code    = nm;
   _current = nm->relocation_begin() - 1;