diff --git a/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp b/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp
index a27e90eada..d97d0e5856 100644
--- a/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp
+++ b/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/amd_memory_region.cpp
@@ -536,10 +536,13 @@ hsa_status_t MemoryRegion::AllowAccess(uint32_t num_agents,
   info.size = sizeof(info);
 
   ScopedAcquire<KernelMutex> lock(&access_lock_);
+
   if (core::Runtime::runtime_singleton_->PtrInfo(const_cast<void*>(ptr), &info, malloc,
                                                  &agent_count, &accessible,
                                                  &blockInfo) == HSA_STATUS_SUCCESS) {
-    if (blockInfo.length != size || info.sizeInBytes != size) {
+    /*  Thunk may return type = HSA_EXT_POINTER_TYPE_UNKNOWN for userptrs */
+    if (info.type != HSA_EXT_POINTER_TYPE_UNKNOWN &&
+        (blockInfo.length != size || info.sizeInBytes != size)) {
       for (int i = 0; i < num_agents; i++) union_agents.push_back(agents[i].handle);
       for (int i = 0; i < agent_count; i++) union_agents.push_back(accessible[i].handle);
       std::sort(union_agents.begin(), union_agents.end());
diff --git a/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/runtime.cpp b/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/runtime.cpp
index e85a224883..a4cb90280f 100644
--- a/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/runtime.cpp
+++ b/projects/rocr-runtime/runtime/hsa-runtime/core/runtime/runtime.cpp
@@ -777,8 +777,11 @@ hsa_status_t Runtime::PtrInfo(const void* ptr, hsa_amd_pointer_info_t* info, voi
     // We don't care if this returns an error code.
     // The type will be HSA_EXT_POINTER_TYPE_UNKNOWN if so.
     auto err = hsaKmtQueryPointerInfo(ptr, &thunkInfo);
-    assert(((err == HSAKMT_STATUS_SUCCESS) || (thunkInfo.Type == HSA_POINTER_UNKNOWN)) &&
-           "Thunk ptr info error and not type HSA_POINTER_UNKNOWN.");
+    if (err != HSAKMT_STATUS_SUCCESS || thunkInfo.Type == HSA_POINTER_UNKNOWN) {
+      memset(info, 0, sizeof(*info));
+      info->type = HSA_EXT_POINTER_TYPE_UNKNOWN;
+      return HSA_STATUS_SUCCESS;
+    }
 
     if (returnListData) {
       assert(thunkInfo.NMappedNodes <= agents_by_node_.size() &&