Protect against possible nil pointer

store/store.go

@@ -458,12 +458,14 @@ func (s *Store) Execute(ex *ExecuteRequest) ([]*sql.Result, error) {
 func (s *Store) ExecuteOrAbort(ex *ExecuteRequest) (results []*sql.Result, retErr error) {
 	defer func() {
 		var errored bool
+		if results != nil {
 			for i := range results {
 				if results[i].Error != "" {
 					errored = true
 					break
 				}
 			}
+		}
 		if retErr != nil || errored {
 			if err := s.db.AbortTransaction(); err != nil {
 				s.logger.Printf("WARNING: failed to abort transaction: %s", err.Error())