diff --git a/src/Interpreters/InterpreterShowTablesQuery.cpp b/src/Interpreters/InterpreterShowTablesQuery.cpp
index 51038aaca46..78580f2ec02 100644
--- a/src/Interpreters/InterpreterShowTablesQuery.cpp
+++ b/src/Interpreters/InterpreterShowTablesQuery.cpp
@@ -121,9 +121,18 @@ String InterpreterShowTablesQuery::getRewrittenQuery()
     if (query.merges)
     {
         WriteBufferFromOwnString rewritten_query;
-        rewritten_query << "SELECT table, database, round((elapsed * (1 / merges.progress)) - merges.elapsed, 2) AS estimate_complete, round(elapsed,2) elapsed, "
-                           "round(progress*100, 2) AS progress, is_mutation, formatReadableSize(total_size_bytes_compressed) AS size_compressed, "
-                           "formatReadableSize(memory_usage) AS memory_usage FROM system.merges";
+        rewritten_query << R"(
+            SELECT
+                table,
+                database,
+                merges.progress > 0 ? round(merges.elapsed * (1 - merges.progress) / merges.progress, 2) : NULL AS estimate_complete,
+                round(elapsed, 2) AS elapsed,
+                round(progress * 100, 2) AS progress,
+                is_mutation,
+                formatReadableSize(total_size_bytes_compressed) AS size_compressed,
+                formatReadableSize(memory_usage) AS memory_usage
+            FROM system.merges
+            )";
 
         if (!query.like.empty())
         {