diff --git a/src/components/views/right_panel/UserInfo.js b/src/components/views/right_panel/UserInfo.js
index 207bf29998..7a88c80ce5 100644
--- a/src/components/views/right_panel/UserInfo.js
+++ b/src/components/views/right_panel/UserInfo.js
@@ -842,10 +842,13 @@ const UserInfo = withLegacyMatrixClient(({matrixClient: cli, user, groupId, room
         const [accepted] = await finished;
         if (!accepted) return;
         try {
-            cli.deactivateSynapseUser(user.userId);
+            await cli.deactivateSynapseUser(user.userId);
         } catch (err) {
+            console.error("Failed to deactivate user");
+            console.error(err);
+
             const ErrorDialog = sdk.getComponent('dialogs.ErrorDialog');
-            Modal.createTrackedDialog('Failed to deactivate user', '', ErrorDialog, {
+            Modal.createTrackedDialog('Failed to deactivate Synapse user', '', ErrorDialog, {
                 title: _t('Failed to deactivate user'),
                 description: ((err && err.message) ? err.message : _t("Operation failed")),
             });
diff --git a/src/components/views/rooms/MemberInfo.js b/src/components/views/rooms/MemberInfo.js
index 2ea6392e96..9364f2f49d 100644
--- a/src/components/views/rooms/MemberInfo.js
+++ b/src/components/views/rooms/MemberInfo.js
@@ -550,7 +550,16 @@ module.exports = createReactClass({
             danger: true,
             onFinished: (accepted) => {
                 if (!accepted) return;
-                this.context.matrixClient.deactivateSynapseUser(this.props.member.userId);
+                this.context.matrixClient.deactivateSynapseUser(this.props.member.userId).catch(e => {
+                    console.error("Failed to deactivate user");
+                    console.error(e);
+
+                    const ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
+                    Modal.createTrackedDialog('Failed to deactivate Synapse user', '', ErrorDialog, {
+                        title: _t('Failed to deactivate user'),
+                        description: ((e && e.message) ? e.message : _t("Operation failed")),
+                    });
+                });
             },
         });
     },