diff --git a/lib/shared/redux/legacy-update-roles-and-permissions.js b/lib/shared/redux/legacy-update-roles-and-permissions.js
--- a/lib/shared/redux/legacy-update-roles-and-permissions.js
+++ b/lib/shared/redux/legacy-update-roles-and-permissions.js
@@ -75,10 +75,16 @@
 
     const roles = { ...threadInfo.roles };
     for (const roleID of Object.keys(roles)) {
-      roles[roleID] = {
-        ...roles[roleID],
-        permissions: computedRolePermissionBlobs[roles[roleID].name],
-      };
+      const name = roles[roleID].name;
+      if (
+        (name === 'Admins' || name === 'Members') &&
+        computedRolePermissionBlobs[name]
+      ) {
+        roles[roleID] = {
+          ...roles[roleID],
+          permissions: computedRolePermissionBlobs[name],
+        };
+      }
     }
     updatedThreadStoreInfos[node.threadID] = {
       ...threadInfo,