diff --git a/cpp/src/db/MySQLMetaImpl.cpp b/cpp/src/db/MySQLMetaImpl.cpp
index 7acff7ab05259f9ce00ed12910b01392a53c9781..0b0cc01e5d2ab1f52848bff8f301185bedb0ef00 100644
--- a/cpp/src/db/MySQLMetaImpl.cpp
+++ b/cpp/src/db/MySQLMetaImpl.cpp
@@ -1247,7 +1247,7 @@ namespace meta {
 //                }
 
                 Query getSizeQuery = connectionPtr->query();
-                getSizeQuery << "SELECT SUM(size) AS sum " <<
+                getSizeQuery << "SELECT IFNULL(SUM(size),0) AS sum " <<
                              "FROM TableFiles " <<
                              "WHERE file_type <> " << std::to_string(TableFileSchema::TO_DELETE) << ";";