diff --git a/src/core/lib/resource_quota/memory_quota.cc b/src/core/lib/resource_quota/memory_quota.cc
index f94ffb319446f..c72c09e9638e4 100644
--- a/src/core/lib/resource_quota/memory_quota.cc
+++ b/src/core/lib/resource_quota/memory_quota.cc
@@ -376,7 +376,7 @@ void BasicMemoryQuota::Take(size_t amount) {
   auto prior = free_bytes_.fetch_sub(amount, std::memory_order_acq_rel);
   // If we push into overcommit, awake the reclaimer.
   if (prior >= 0 && prior < static_cast<intptr_t>(amount)) {
-    reclaimer_activity_->ForceWakeup();
+    if (reclaimer_activity_ != nullptr) reclaimer_activity_->ForceWakeup();
   }
 }
 
diff --git a/test/core/resource_quota/memory_quota_fuzzer_corpus/testcase-replenish-nullchk b/test/core/resource_quota/memory_quota_fuzzer_corpus/testcase-replenish-nullchk
new file mode 100644
index 0000000000000..e3df978476131
--- /dev/null
+++ b/test/core/resource_quota/memory_quota_fuzzer_corpus/testcase-replenish-nullchk
@@ -0,0 +1,1601 @@
+actions {
+  quota: 2
+  create_quota {
+  }
+}
+actions {
+  quota: 2
+  allocator: 8704
+  allocation: 2
+  set_quota_size: 171798691840
+}
+actions {
+  quota: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+}
+actions {
+  quota: 2
+  allocator: -1610612735
+  create_allocator {
+  }
+}
+actions {
+  quota: -1610612735
+  allocation: 7
+}
+actions {
+  quota: 2
+  allocator: 10682370
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 3
+  create_allocator {
+  }
+}
+actions {
+  allocator: 44
+  allocation: 2
+  flush_exec_ctx {
+  }
+}
+actions {
+  quota: 2
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  post_reclaimer {
+    pass: DESTRUCTIVE
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+}
+actions {
+  quota: 2
+  allocator: 7
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 44
+  delete_quota {
+  }
+}
+actions {
+  allocation: 2
+}
+actions {
+  rebind_quota {
+  }
+}
+actions {
+  quota: 2
+  allocator: 45
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  flush_exec_ctx {
+  }
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+}
+actions {
+  quota: 2
+  allocator: 8704
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 7
+  set_quota_size: 0
+}
+actions {
+  quota: 2
+  allocator: 44
+  allocation: 2
+}
+actions {
+  quota: 2
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: -2147483641
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
+  delete_allocator {
+  }
+}
+actions {
+  allocation: 2
+}
+actions {
+  rebind_quota {
+  }
+}
+actions {
+  quota: 2
+  allocator: 44
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  create_quota {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+}
+actions {
+  quota: 2
+  allocation: 2
+}
+actions {
+  quota: 44
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
+  delete_allocator {
+  }
+}
+actions {
+  allocation: 2
+}
+actions {
+  rebind_quota {
+  }
+}
+actions {
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 44
+}
+actions {
+  quota: 2
+  allocator: 8704
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 7
+  create_allocator {
+  }
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+  allocation: 2
+  create_allocator {
+  }
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+actions {
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+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
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+  }
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+  }
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+  delete_allocator {
+  }
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+}
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+  allocation: 2
+  create_allocator {
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+  }
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+}
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+  }
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+actions {
+}
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+  allocation: 2
+  create_allocator {
+  }
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+  delete_allocator {
+  }
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+  create_allocator {
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+  delete_allocator {
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+  allocation: 2
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+actions {
+  create_allocator {
+  }
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+  allocation: 2
+  create_allocator {
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+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocation: 44
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
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+  quota: 2
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+}
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+  allocator: 8704
+  allocation: 2
+  create_allocator {
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+  create_allocator {
+  }
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+  create_allocator {
+  }
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+}
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+  set_quota_size: 171790
+}
+actions {
+  quota: 2
+  allocator: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
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+  create_allocator {
+  }
+}
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+  allocation: 2
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+  }
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+}
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+  delete_quota {
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+  quota: 10
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  allocation: 2
+  create_allocator {
+  }
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+  create_allocator {
+  }
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+  }
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+  }
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+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
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+  create_allocator {
+  }
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+  delete_allocator {
+  }
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+  }
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+}
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+  create_allocator {
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+actions {
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+  create_allocator {
+  }
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
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+  quota: 2
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+  create_allocator {
+  }
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+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
+  flush_exec_ctx {
+  }
+}
+actions {
+  quota: 2097152
+  allocation: 2
+}
+actions {
+  create_quota {
+  }
+}
+actions {
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+  allocation: 2
+  create_allocator {
+  }
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+actions {
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+  }
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+  }
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+  }
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+  create_allocator {
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+  }
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+  }
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+  }
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+  }
+}
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+}
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+  }
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+}
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+}
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+  create_allocation {
+    max: 1936942413
+  }
+}
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+  }
+}
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+}
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+}
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+}
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+}
+actions {
+  quota: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 7
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 44
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
+  allocation: 44
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2097152
+  allocation: 2
+}
+actions {
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 262188
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  rebind_quota {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+  rebind_quota {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
+  delete_allocator {
+  }
+}
+actions {
+  allocation: 2
+}
+actions {
+  allocator: 7610368
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 44
+  rebind_quota {
+  }
+}
+actions {
+  quota: 2
+  allocator: 8704
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 8704
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 7
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 44
+  allocation: 2567
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
+  delete_allocator {
+  }
+}
+actions {
+  allocation: 2
+}
+actions {
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 44
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+}
+actions {
+  quota: 2
+  allocator: 8704
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 2
+  create_quota {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  quota: 67108864
+}
+actions {
+  quota: 2
+  allocator: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 2
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+  create_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocator: 7
+  create_allocator {
+  }
+}
+actions {
+  allocation: 2
+}
+actions {
+}
+actions {
+  quota: 2
+  allocator: 44
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  delete_allocator {
+  }
+}
+actions {
+  quota: 2
+  allocator: 7
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+}
+actions {
+  quota: 2
+  allocation: 2
+  create_allocator {
+  }
+}
+actions {
+  allocation: 2
+}
+actions {
+  allocation: 2
+  delete_allocator {
+  }
+}
+
diff --git a/test/core/resource_quota/memory_quota_fuzzer_corpus/testcase-replenish-nullchk-after-creduce b/test/core/resource_quota/memory_quota_fuzzer_corpus/testcase-replenish-nullchk-after-creduce
new file mode 100644
index 0000000000000..f941e8a7f29f6
--- /dev/null
+++ b/test/core/resource_quota/memory_quota_fuzzer_corpus/testcase-replenish-nullchk-after-creduce
@@ -0,0 +1,15 @@
+actions {
+  create_quota {}
+}
+actions {
+  create_allocator {}
+}
+actions{set_quota_size : 790} actions {
+  delete_quota {}
+}
+actions {
+  create_allocation {
+  max:
+    2
+  }
+}