diff --git a/marker/schema/groups/page.py b/marker/schema/groups/page.py
index c00af1f5..6c5d9983 100644
--- a/marker/schema/groups/page.py
+++ b/marker/schema/groups/page.py
@@ -84,6 +84,8 @@ def assemble_html(self, child_blocks, parent_structure=None):
 
     def compute_line_block_intersections(self, provider_outputs: List[ProviderOutput]):
         max_intersections = {}
+        if not self.children:
+            return max_intersections
 
         blocks = [
             block for block in self.children