diff --git a/news/1775.bugfix b/news/1775.bugfix
new file mode 100644
index 0000000000..f0b3cd0e47
--- /dev/null
+++ b/news/1775.bugfix
@@ -0,0 +1 @@
+Users service: Fixed edge case AttributeError if a user is enumerated but doesn't actually exist. @davisagli
diff --git a/src/plone/restapi/services/users/get.py b/src/plone/restapi/services/users/get.py
index e900b7de6f..235639c785 100644
--- a/src/plone/restapi/services/users/get.py
+++ b/src/plone/restapi/services/users/get.py
@@ -115,7 +115,9 @@ def _principal_search_results(
         principals = []
         for principal_info in search_for_principal(hunter, self.search_term):
             principal_id = principal_info[id_key]
-            principals.append(get_principal_by_id(principal_id))
+            principal = get_principal_by_id(principal_id)
+            if principal is not None:
+                principals.append(principal)
 
         return principals