diff --git a/src/import_data.jl b/src/import_data.jl
index 008a469..9e5d1de 100644
--- a/src/import_data.jl
+++ b/src/import_data.jl
@@ -141,7 +141,15 @@ function add_psboard_ids(db::SQLite.DB, single_result_table::DataFrame)
         dropmissing!(df, :daughterboard)
         return (daughterboard = df.daughterboard |> last,)
     end
-    filter!(:motherboard_id => !=(999999), df)
+    try
+        filter!(:motherboard_id => !=(999999), df)
+    catch
+        id_missings = findall(ismissing, df.motherboard_id)
+        if !isempty(id_missings)
+            @error "motherboard id at row $(id_missings) are missing. motherboard id cannot be null"
+            error("single_result_table format error")
+        end
+    end
 
     stmt_insert_psbid = DBInterface.prepare(
         db,