fix(migration): ignore volumes with no created timestamp EE-1966

api/bolt/migrator/migrate_dbversion31.go

@@ -218,8 +218,12 @@ func findResourcesToUpdateForDB32(dockerID string, volumesData map[string]interf
 		if !nameExist {
 			continue
 		}
+		createTime, createTimeExist := volume["CreatedAt"].(string)
+		if !createTimeExist {
+			continue
+		}
 
-		oldResourceID := fmt.Sprintf("%s%s", volumeName, volume["CreatedAt"].(string))
+		oldResourceID := fmt.Sprintf("%s%s", volumeName, createTime)
 		resourceControl, ok := volumeResourceControls[oldResourceID]
 
 		if ok {