memory crash here

row.cpp

@@ -157,6 +157,9 @@ void Row::setColumnValue(ColDefNode *col_def, ValueNode *col_value) {
 
 int Row::compare(const Row &other) const {
 	for (size_t ci = 0; ci < m_columns.size(); ci++) {
+		// CRASHES HERE
+		// auto a = this->operator[](ci).getStringValue();
+		// auto b = other[ci].getStringValue();
 		int cmp = this->operator[](ci).compare(other[ci]);
 		if (cmp != 0) return cmp;
 	}