diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index 7795bb2610..ced24e2547 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -695,6 +695,7 @@
     "Error leaving room": "Error leaving room",
     "Unrecognised address": "Unrecognised address",
     "You do not have permission to invite people to this room.": "You do not have permission to invite people to this room.",
+    "User %(userId)s is already invited to the room": "User %(userId)s is already invited to the room",
     "User %(userId)s is already in the room": "User %(userId)s is already in the room",
     "User %(user_id)s does not exist": "User %(user_id)s does not exist",
     "User %(user_id)s may or may not exist": "User %(user_id)s may or may not exist",
diff --git a/src/utils/MultiInviter.ts b/src/utils/MultiInviter.ts
index a7d1accde1..ddf2643336 100644
--- a/src/utils/MultiInviter.ts
+++ b/src/utils/MultiInviter.ts
@@ -39,6 +39,9 @@ const UNKNOWN_PROFILE_ERRORS = ['M_NOT_FOUND', 'M_USER_NOT_FOUND', 'M_PROFILE_UN
 
 export type CompletionStates = Record<string, InviteState>;
 
+const USER_ALREADY_JOINED = "IO.ELEMENT.ALREADY_JOINED";
+const USER_ALREADY_INVITED = "IO.ELEMENT.ALREADY_INVITED";
+
 /**
  * Invites multiple addresses to a room or group, handling rate limiting from the server
  */
@@ -130,9 +133,14 @@ export default class MultiInviter {
             if (!room) throw new Error("Room not found");
 
             const member = room.getMember(addr);
-            if (member && ['join', 'invite'].includes(member.membership)) {
-                throw new new MatrixError({
-                    errcode: "RIOT.ALREADY_IN_ROOM",
+            if (member.membership === "join") {
+                throw new MatrixError({
+                    errcode: USER_ALREADY_JOINED,
+                    error: "Member already joined",
+                });
+            } else if (member.membership === "invite") {
+                throw new MatrixError({
+                    errcode: USER_ALREADY_INVITED,
                     error: "Member already invited",
                 });
             }
@@ -180,30 +188,47 @@ export default class MultiInviter {
 
                 let errorText;
                 let fatal = false;
-                if (err.errcode === 'M_FORBIDDEN') {
-                    fatal = true;
-                    errorText = _t('You do not have permission to invite people to this room.');
-                } else if (err.errcode === "RIOT.ALREADY_IN_ROOM") {
-                    errorText = _t("User %(userId)s is already in the room", { userId: address });
-                } else if (err.errcode === 'M_LIMIT_EXCEEDED') {
-                    // we're being throttled so wait a bit & try again
-                    setTimeout(() => {
-                        this.doInvite(address, ignoreProfile).then(resolve, reject);
-                    }, 5000);
-                    return;
-                } else if (['M_NOT_FOUND', 'M_USER_NOT_FOUND'].includes(err.errcode)) {
-                    errorText = _t("User %(user_id)s does not exist", { user_id: address });
-                } else if (err.errcode === 'M_PROFILE_UNDISCLOSED') {
-                    errorText = _t("User %(user_id)s may or may not exist", { user_id: address });
-                } else if (err.errcode === 'M_PROFILE_NOT_FOUND' && !ignoreProfile) {
-                    // Invite without the profile check
-                    console.warn(`User ${address} does not have a profile - inviting anyways automatically`);
-                    this.doInvite(address, true).then(resolve, reject);
-                } else if (err.errcode === "M_BAD_STATE") {
-                    errorText = _t("The user must be unbanned before they can be invited.");
-                } else if (err.errcode === "M_UNSUPPORTED_ROOM_VERSION") {
-                    errorText = _t("The user's homeserver does not support the version of the room.");
-                } else {
+                switch (err.errcode) {
+                    case "M_FORBIDDEN":
+                        errorText = _t('You do not have permission to invite people to this room.');
+                        fatal = true;
+                        break;
+                    case USER_ALREADY_INVITED:
+                        errorText = _t("User %(userId)s is already invited to the room", { userId: address });
+                        break;
+                    case USER_ALREADY_JOINED:
+                        errorText = _t("User %(userId)s is already in the room", { userId: address });
+                        break;
+                    case "M_LIMIT_EXCEEDED":
+                        // we're being throttled so wait a bit & try again
+                        setTimeout(() => {
+                            this.doInvite(address, ignoreProfile).then(resolve, reject);
+                        }, 5000);
+                        return;
+                    case "M_NOT_FOUND":
+                    case "M_USER_NOT_FOUND":
+                        errorText = _t("User %(user_id)s does not exist", { user_id: address });
+                        break;
+                    case "M_PROFILE_UNDISCLOSED":
+                        errorText = _t("User %(user_id)s may or may not exist", { user_id: address });
+                        break;
+                    case "M_PROFILE_NOT_FOUND":
+                        if (!ignoreProfile) {
+                            // Invite without the profile check
+                            console.warn(`User ${address} does not have a profile - inviting anyways automatically`);
+                            this.doInvite(address, true).then(resolve, reject);
+                            return;
+                        }
+                        break;
+                    case "M_BAD_STATE":
+                        errorText = _t("The user must be unbanned before they can be invited.");
+                        break;
+                    case "M_UNSUPPORTED_ROOM_VERSION":
+                        errorText = _t("The user's homeserver does not support the version of the room.");
+                        break;
+                }
+
+                if (!errorText) {
                     errorText = _t('Unknown server error');
                 }