diff --git a/python/sglang/srt/mem_cache/allocator.py b/python/sglang/srt/mem_cache/allocator.py
index 8be1be85a..497331673 100644
--- a/python/sglang/srt/mem_cache/allocator.py
+++ b/python/sglang/srt/mem_cache/allocator.py
@@ -283,7 +283,7 @@ class SWATokenToKVPoolAllocator(BaseTokenToKVPoolAllocator):
         self.swa_attn_allocator.clear()
         self.full_attn_allocator.clear()
         self.full_to_swa_index_mapping.fill_(0)
-        self.is_in_free_group = False
+        self.is_not_in_free_group = True
         self.free_group = []