fix logic

1 files changed, 5 insertions, 5 deletions

diff --git a/arch/x86_64/src/memory/paging/page_mapper.cpp b/arch/x86_64/src/memory/paging/page_mapper.cpp
index eaafafa..eb1e18c 100644
--- a/arch/x86_64/src/memory/paging/page_mapper.cpp
+++ b/arch/x86_64/src/memory/paging/page_mapper.cpp
@@ -88,15 +88,15 @@ namespace teachos::arch::memory::paging
       std::size_t level_index = page.get_level_index(level);
       is_valid = page_table.next_table(level_index);
 
-      std::optional<allocator::physical_frame> allocated_frame = allocator.allocate_frame();
-      exception_handling::assert(!allocated_frame.has_value(), "[Page mapper]: Unable to allocate frame");
-      page_table[level_index].set_entry(allocated_frame.value(), entry::PRESENT | entry::WRITABLE);
-      page_table.zero_entries();
-
       if (!is_valid)
       {
         break;
       }
+
+      auto allocated_frame = allocator.allocate_frame();
+      exception_handling::assert(!allocated_frame.has_value(), "[Page mapper]: Unable to allocate frame");
+      page_table[level_index].set_entry(allocated_frame.value(), entry::PRESENT | entry::WRITABLE);
+      page_table.zero_entries();
     }
 
     entry page_table_entry = page_table[page.get_level_index(page_table::LEVEL1)];