--- old/src/share/vm/opto/compile.cpp	2017-07-14 16:33:37.385651960 +0200
+++ new/src/share/vm/opto/compile.cpp	2017-07-14 16:33:37.301651964 +0200
@@ -1540,7 +1540,7 @@
     }
 
     ciKlass* klass = tk->klass();
-    if( klass->is_obj_array_klass() ) {
+    if (klass != NULL && klass->is_obj_array_klass()) {
       ciKlass* k = TypeAryPtr::OOPS->klass();
       if( !k || !k->is_loaded() )                  // Only fails for some -Xcomp runs
         k = TypeInstPtr::BOTTOM->klass();
@@ -4163,11 +4163,11 @@
 // (2) subklass does not overlap with superklass => always fail
 // (3) superklass has NO subtypes and we can check with a simple compare.
 int Compile::static_subtype_check(ciKlass* superk, ciKlass* subk) {
-  if (StressReflectiveCode) {
+  if (StressReflectiveCode || superk == NULL || subk == NULL) {
     return SSC_full_test;       // Let caller generate the general case.
   }
 
-  if (superk == env()->Object_klass()) {
+  if (!EnableMVT && !EnableValhalla && superk == env()->Object_klass()) {
     return SSC_always_true;     // (0) this test cannot fail
   }