diff --git a/public/content/cards.js b/public/content/cards.js
index ef838c63..312c2824 100644
--- a/public/content/cards.js
+++ b/public/content/cards.js
@@ -1,8 +1,6 @@
 // Here you'll find all the default cards used in the game.
 // See game/cards.js for the details on how they work.
 
-//put cards here, to make it easier to add more
-
 export default [
 	{
 		name: 'Strike',
@@ -481,7 +479,6 @@ export default [
 	},*/
 	// {name: 'Flex', energy: 0, type: 'skill', description: 'Gain 2 Strength.'},
 ]
-//cards should be split into seperate card files to make editing a single card easier
 
 // 'codices.jpg'
 // 'alice-holds-the-white-king.jpg'
diff --git a/public/game/actions.js b/public/game/actions.js
index 2cab703a..a83f203e 100644
--- a/public/game/actions.js
+++ b/public/game/actions.js
@@ -235,11 +235,14 @@ export function useCardActions(state, {target, card}) {
 		if (action.conditions && !conditionsAreValid(action.conditions, state)) {
 			return newState
 		}
-		// Make sure the action is called with a target.
 		if (!action.parameter) action.parameter = {}
-		// Prefer the target you dropped the card on.
+
+		// Make sure the action is called with a target, preferably the target you dropped the card on.
 		action.parameter.target = target
-		action.parameter.card = card
+
+		// We used to set the card here, which caused a circular JSON structure. Removing this line fixed that, but keeping this comment here for now, in case something breaks.
+		// action.parameter.card = card
+
 		// Run the action
 		newState = allActions[action.type](newState, action.parameter)
 	})
diff --git a/public/game/backend.js b/public/game/backend.js
index 3908afae..5509b7dc 100644
--- a/public/game/backend.js
+++ b/public/game/backend.js
@@ -2,6 +2,15 @@ import {isDungeonCompleted} from '../game/utils-state.js'
 
 const apiUrl = 'https://api.slaytheweb.cards/api/runs'
 // const apiUrl = 'http://localhost:3000/api/runs'
+//
+
+/**
+ * @typedef {object} Run
+ * @property {string} name - user inputted player name
+ * @property {boolean} win - whether the player won the game
+ * @property {object} state - the final state
+ * @property {Array<Object>} past - a list of past states
+ */
 
 /**
  * Saves a "game" object into a remote database.
@@ -16,13 +25,22 @@ export function postRun(game, name) {
 		state: game.state,
 		past: game.past.list,
 	}
+
+	let body
+	try {
+		body = JSON.stringify(run)
+	} catch (err) {
+		console.log(err, run)
+		throw new Error('Could not stringify run')
+	}
+
 	return fetch(apiUrl, {
 		method: 'POST',
 		headers: {
 			Accept: 'application/json',
 			'Content-Type': 'application/json',
 		},
-		body: JSON.stringify(run),
+		body,
 	})
 }
 
diff --git a/public/game/cards.js b/public/game/cards.js
index 4436d433..88b25328 100644
--- a/public/game/cards.js
+++ b/public/game/cards.js
@@ -42,6 +42,7 @@ export const CardTargets = {
  * @prop {CardTargets} target - a special "target" string to specify which targets the card affects.
  * color = [RED, GREEN, BLUE, PURPLE, COLORLESS, CURSE]
  * rarity = [BASIC, SPECIAL, COMMON, UNCOMMON, RARE, CURSE]
+ * @prop {boolean} exhaust - whether the card will exhaust when played.
  *
  * @prop {CARDPOWERS} [powers] - Cards can apply POWERS with the `powers` object. Powers are hardcoded in the game actions, but feel free to add more.
  * @prop {Array<CardAction>} [actions] - Cards can _optionally_ define a list of `actions`. These actions will be run, in defined order, when the card is played.