diff --git a/src/hotspot/share/gc/g1/g1HeapRegion.inline.hpp b/src/hotspot/share/gc/g1/g1HeapRegion.inline.hpp
index 4f242b7a537..f92e37fee3c 100644
--- a/src/hotspot/share/gc/g1/g1HeapRegion.inline.hpp
+++ b/src/hotspot/share/gc/g1/g1HeapRegion.inline.hpp
@@ -42,6 +42,11 @@
 #include "utilities/globalDefinitions.hpp"
 
 inline HeapWord* G1HeapRegion::block_start(const void* addr) const {
+  if (is_young()) {
+    // We are here because of BlockLocationPrinter.
+    // Can be invoked in any context, so this region might not be parsable.
+    return nullptr;
+  }
   return block_start(addr, parsable_bottom_acquire());
 }
 
@@ -64,6 +69,7 @@ inline HeapWord* G1HeapRegion::advance_to_block_containing_addr(const void* addr
 
 inline HeapWord* G1HeapRegion::block_start(const void* addr, HeapWord* const pb) const {
   assert(addr >= bottom() && addr < top(), "invalid address");
+  assert(!is_young(), "Only non-young regions have BOT");
   HeapWord* first_block = _bot->block_start_reaching_into_card(addr);
   return advance_to_block_containing_addr(addr, pb, first_block);
 }