--- old/src/hotspot/share/opto/callnode.cpp	2018-07-04 16:48:45.145121626 +0200
+++ new/src/hotspot/share/opto/callnode.cpp	2018-07-04 16:48:44.701121632 +0200
@@ -849,6 +849,7 @@
 }
 
 bool CallNode::has_debug_use(Node *n) {
+  assert(jvms() != NULL, "jvms should not be null");
   for (uint i = jvms()->debug_start(); i < jvms()->debug_end(); i++) {
     Node *arg = in(i);
     if (arg == n) {