Don't try to allocate the debug info before the process heap exists.

dlls/ntdll/critsection.c

@@ -74,6 +74,9 @@ static inline HANDLE get_semaphore( RTL_CRITICAL_SECTION *crit )
  */
 NTSTATUS WINAPI RtlInitializeCriticalSection( RTL_CRITICAL_SECTION *crit )
 {
+    if (!ntdll_get_process_heap()) crit->DebugInfo = NULL;
+    else
+    {
         crit->DebugInfo = RtlAllocateHeap(ntdll_get_process_heap(), 0, sizeof(CRITICAL_SECTION_DEBUG));
         if (crit->DebugInfo)
         {
@@ -87,6 +90,7 @@ NTSTATUS WINAPI RtlInitializeCriticalSection( RTL_CRITICAL_SECTION *crit )
             crit->DebugInfo->Spare[0] = 0;
             crit->DebugInfo->Spare[1] = 0;
         }
+    }
     crit->LockCount      = -1;
     crit->RecursionCount = 0;
     crit->OwningThread   = 0;