# Zero Sum error: can't read protected property

**URL:** <https://discourse.codecombat.com/t/zero-sum-error-cant-read-protected-property/7541>\
**Category:** Bugs\
**Created:** [May 12, 2016, 11:53am UTC](https://discourse.codecombat.com/t/zero-sum-error-cant-read-protected-property/7541 "2016-05-12T11:53:44Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![UltCombo](https://sea2.discourse-cdn.com/flex016/user_avatar/discourse.codecombat.com/ultcombo/32/3822_2.png) [@UltCombo](https://discourse.codecombat.com/u/UltCombo)\
**Post date:** [May 12, 2016, 5:13pm UTC](https://discourse.codecombat.com/t/zero-sum-error-cant-read-protected-property/7541/2 "2016-05-12T17:13:28Z")

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It looks like an issue in the new interpreter (Esper). See this [related thread](https://discourse.codecombat.com/t/backwoods-forest-friend-and-foe-errror/7477) where @nick has replied.

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