diff --git a/src/Columns/ColumnObject.cpp b/src/Columns/ColumnObject.cpp
index 07872774559..4fa0c3ee41a 100644
--- a/src/Columns/ColumnObject.cpp
+++ b/src/Columns/ColumnObject.cpp
@@ -626,6 +626,9 @@ ColumnObject::ColumnObject(Subcolumns && subcolumns_, bool is_nullable_)
 
 void ColumnObject::checkConsistency() const
 {
+    if (num_rows && subcolumns.empty())
+        throw Exception(ErrorCodes::LOGICAL_ERROR, "ColumnObject is inconsistent: it has no subcolumns, but has {} rows", num_rows);
+
     if (subcolumns.empty())
         return;
 
@@ -642,9 +645,9 @@ void ColumnObject::checkConsistency() const
 
 size_t ColumnObject::size() const
 {
-#ifndef NDEBUG
+// #ifndef NDEBUG
     checkConsistency();
-#endif
+// #endif
     return num_rows;
 }
 
@@ -711,6 +714,8 @@ void ColumnObject::insert(const Field & field)
     }
 
     ++num_rows;
+
+    checkConsistency();
 }
 
 void ColumnObject::insertDefault()
@@ -719,6 +724,8 @@ void ColumnObject::insertDefault()
         entry->data.insertDefault();
 
     ++num_rows;
+
+    checkConsistency();
 }
 
 Field ColumnObject::operator[](size_t n) const
@@ -776,6 +783,8 @@ void ColumnObject::insertRangeFrom(const IColumn & src, size_t start, size_t len
 
     num_rows += length;
     finalize();
+
+    checkConsistency();
 }
 
 void ColumnObject::popBack(size_t length)
@@ -784,6 +793,7 @@ void ColumnObject::popBack(size_t length)
         entry->data.popBack(length);
 
     num_rows -= length;
+    checkConsistency();
 }
 
 template <typename Func>
diff --git a/tests/queries/0_stateless/02789_object_type_invalid_num_of_rows.sql b/tests/queries/0_stateless/02789_object_type_invalid_num_of_rows.sql
index 8ced133c8eb..a9c8a844aa0 100644
--- a/tests/queries/0_stateless/02789_object_type_invalid_num_of_rows.sql
+++ b/tests/queries/0_stateless/02789_object_type_invalid_num_of_rows.sql
@@ -1,2 +1,2 @@
 set allow_experimental_object_type=1;
-SELECT '0.02' GROUP BY GROUPING SETS (('6553.6'), (CAST(CAST('{"x" : 1}', 'Object(Nullable(\'json\'))'), 'Object(\'json\')'))) settings max_threads=1; -- { serverError NOT_IMPLEMENTED }
+SELECT '0.02' GROUP BY GROUPING SETS (('6553.6'), (CAST('{"x" : 1}', 'Object(\'json\')'))) settings max_threads=1; -- { serverError NOT_IMPLEMENTED }