diff --git a/apps/explorer/lib/explorer/chain/import/runner/blocks.ex b/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
index 08ad720a0f..aa80e6c251 100644
--- a/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
+++ b/apps/explorer/lib/explorer/chain/import/runner/blocks.ex
@@ -75,6 +75,7 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
           number
         end)
         |> Enum.sort()
+        |> Enum.uniq()
 
       remove_nonconsensus_data(
         repo,