Hi! In 0.7.2 a detector destroyed by another mod's script (or with its surface) stays in storage.Pollution_Detectors, and the next update crashes with "LuaEntity API call when LuaEntity was invalid". Details and a fix: https://github.com/az3/factorio-pollution-detector/issues/3, https://github.com/az3/factorio-pollution-detector/pull/4