diff --git a/client/src/actions/NetworkAction.ts b/client/src/actions/NetworkAction.ts
index 84d8b97..3a806e6 100644
--- a/client/src/actions/NetworkAction.ts
+++ b/client/src/actions/NetworkAction.ts
@@ -69,7 +69,10 @@ export const SERVER_FAILED = "SERVER_FAILED"
 /** Sent in response to the client's ClientNestedAction, if it fails and has not been applied to the server map. */
 export interface ServerFailedAction extends BaseAction {
     readonly type: typeof SERVER_FAILED
-    readonly failures: readonly ActionFailure[]
+    /** The IDs of the failed actions, all of which failed with the same error. */
+    readonly ids: readonly number[]
+    /** The error the above actions failed with. */
+    readonly error: string
 }
 export function isServerFailedAction(action: AppAction): action is ServerFailedAction {
     return action.type === SERVER_FAILED
diff --git a/client/src/reducers/ServerReducer.ts b/client/src/reducers/ServerReducer.ts
index 637cde5..b057a58 100644
--- a/client/src/reducers/ServerReducer.ts
+++ b/client/src/reducers/ServerReducer.ts
@@ -156,10 +156,10 @@ function serverFailedReducer(oldState: AppState, action: ServerFailedAction): Ap
         return oldState
     }
     const failedIndexes: {[id: number]: boolean|undefined} = {}
-    for (let index = 0; index < action.failures.length; index += 1) {
-        failedIndexes[action.failures[index].id] = true
+    for (let index = 0; index < action.ids.length; index += 1) {
+        failedIndexes[action.ids[index]] = true
     }
-    // TODO: Figure out somewhere to put the failures for logging purposes, so the messages aren't wasted.
+    // TODO: Figure out somewhere to put the failure message for logging purposes, so the messages aren't wasted.
     /* const failedActions = */
     oldState.network.sentActions.filter((sent) => !!failedIndexes[sent.id]).map((sent) => sent.action)
     const stillWaitingActions = oldState.network.sentActions.filter((sent) => !failedIndexes[sent.id])