diff --git a/core/server/api/canary/members.js b/core/server/api/canary/members.js
index a8efc1d453..b1dfd696cd 100644
--- a/core/server/api/canary/members.js
+++ b/core/server/api/canary/members.js
@@ -225,7 +225,10 @@ const members = {
                 return decorateWithSubscriptions(member);
             } catch (error) {
                 if (error.code && error.message.toLowerCase().indexOf('unique') !== -1) {
-                    throw new errors.ValidationError({message: i18n.t('errors.api.members.memberAlreadyExists')});
+                    throw new errors.ValidationError({
+                        message: i18n.t('errors.api.members.memberAlreadyExists.message'),
+                        context: i18n.t('errors.api.members.memberAlreadyExists.context')
+                    });
                 }
 
                 // NOTE: failed to link Stripe customer/plan/subscription
@@ -482,7 +485,7 @@ const members = {
             }).then(() => {
                 // NOTE: grouping by context because messages can contain unique data like "customer_id"
                 const groupedErrors = _.groupBy(invalid.errors, 'context');
-                const uniqueErrors = _.uniq(invalid.errors, 'context');
+                const uniqueErrors = _.uniqBy(invalid.errors, 'context');
 
                 const outputErrors = uniqueErrors.map((error) => {
                     let errorGroup = groupedErrors[error.context];
diff --git a/core/server/translations/en.json b/core/server/translations/en.json
index a34e45559e..09a5528255 100644
--- a/core/server/translations/en.json
+++ b/core/server/translations/en.json
@@ -368,7 +368,10 @@
             },
             "members": {
                 "memberNotFound": "Member not found.",
-                "memberAlreadyExists": "Email address is already member.",
+                "memberAlreadyExists": {
+                    "message": "Email address is already member.",
+                    "context": "Attempting to add member with existing email address."
+                },
                 "stripeNotConnected": {
                     "message": "Member not imported, Stripe account missing",
                     "context": "Attempting to import members with Stripe data when there is no Stripe account connected",