diff --git a/changelogs/fragments/keycloak-user-rolemapping-client-none-check.yml b/changelogs/fragments/keycloak-user-rolemapping-client-none-check.yml
new file mode 100644
index 0000000000..d6916c2af8
--- /dev/null
+++ b/changelogs/fragments/keycloak-user-rolemapping-client-none-check.yml
@@ -0,0 +1,5 @@
+bugfixes:
+  - keycloak_user_rolemapping - fix ``TypeError`` crash when adding a client
+    role to a user who has no existing roles for that client
+    (https://github.com/ansible-collections/community.general/issues/10960,
+    https://github.com/ansible-collections/community.general/pull/11471).
diff --git a/plugins/modules/keycloak_user_rolemapping.py b/plugins/modules/keycloak_user_rolemapping.py
index cc3004fca0..95a853913a 100644
--- a/plugins/modules/keycloak_user_rolemapping.py
+++ b/plugins/modules/keycloak_user_rolemapping.py
@@ -356,9 +356,9 @@ def main():
                     if role_rep is not None:
                         role["name"] = role_rep["name"]
                 else:
-                    role["name"] = kc.get_client_user_rolemapping_by_id(
-                        uid=uid, cid=cid, rid=role.get("id"), realm=realm
-                    )["name"]
+                    role_rep = kc.get_client_user_rolemapping_by_id(uid=uid, cid=cid, rid=role.get("id"), realm=realm)
+                    if role_rep is not None:
+                        role["name"] = role_rep["name"]
                 if role.get("name") is None:
                     module.fail_json(
                         msg=f"Could not fetch role {role.get('id')} for client_id {client_id} or realm {realm}"
diff --git a/tests/integration/targets/keycloak_user_rolemapping/tasks/main.yml b/tests/integration/targets/keycloak_user_rolemapping/tasks/main.yml
index ff56371e58..318e47bedd 100644
--- a/tests/integration/targets/keycloak_user_rolemapping/tasks/main.yml
+++ b/tests/integration/targets/keycloak_user_rolemapping/tasks/main.yml
@@ -37,8 +37,8 @@
 
 - name: Map a realm role to client service account
   vars:
-    - roles:
-        - name: '{{ role }}'
+    roles:
+      - name: '{{ role }}'
   community.general.keycloak_user_rolemapping:
     auth_keycloak_url: "{{ url }}"
     auth_realm: "{{ admin_realm }}"
@@ -58,8 +58,8 @@
 
 - name: Unmap a realm role from client service account
   vars:
-    - roles:
-        - name: '{{ role }}'
+    roles:
+      - name: '{{ role }}'
   community.general.keycloak_user_rolemapping:
     auth_keycloak_url: "{{ url }}"
     auth_realm: "{{ admin_realm }}"
@@ -89,6 +89,18 @@
     name: "{{ role }}"
     state: absent
 
+- name: Create second client (for cross-client role mapping test)
+  community.general.keycloak_client:
+    auth_keycloak_url: "{{ url }}"
+    auth_realm: "{{ admin_realm }}"
+    auth_username: "{{ admin_user }}"
+    auth_password: "{{ admin_password }}"
+    realm: "{{ realm }}"
+    client_id: "{{ client_id_2 }}"
+    service_accounts_enabled: true
+    state: present
+  register: client_2
+
 - name: Create new client role
   community.general.keycloak_role:
     auth_keycloak_url: "{{ url }}"
@@ -101,10 +113,54 @@
     description: "{{ description_1 }}"
     state: present
 
+- name: Map a client role to a user with no existing roles for that client
+  vars:
+    roles:
+      - name: '{{ role }}'
+  community.general.keycloak_user_rolemapping:
+    auth_keycloak_url: "{{ url }}"
+    auth_realm: "{{ admin_realm }}"
+    auth_username: "{{ admin_user }}"
+    auth_password: "{{ admin_password }}"
+    realm: "{{ realm }}"
+    client_id: "{{ client_id }}"
+    service_account_user_client_id: "{{ client_id_2 }}"
+    roles: "{{ roles }}"
+    state: present
+  register: result
+
+- name: Assert client role is assigned to user with no prior roles
+  assert:
+    that:
+      - result is changed
+      - result.end_state | selectattr("clientRole", "eq", true) | selectattr("name", "eq", role) | list | count > 0
+
+- name: Unmap the cross-client role mapping
+  vars:
+    roles:
+      - name: '{{ role }}'
+  community.general.keycloak_user_rolemapping:
+    auth_keycloak_url: "{{ url }}"
+    auth_realm: "{{ admin_realm }}"
+    auth_username: "{{ admin_user }}"
+    auth_password: "{{ admin_password }}"
+    realm: "{{ realm }}"
+    client_id: "{{ client_id }}"
+    service_account_user_client_id: "{{ client_id_2 }}"
+    roles: "{{ roles }}"
+    state: absent
+  register: result
+
+- name: Assert cross-client role mapping is removed
+  assert:
+    that:
+      - result is changed
+      - result.end_state == []
+
 - name: Map a client role to client service account
   vars:
-    - roles:
-        - name: '{{ role }}'
+    roles:
+      - name: '{{ role }}'
   community.general.keycloak_user_rolemapping:
     auth_keycloak_url: "{{ url }}"
     auth_realm: "{{ admin_realm }}"
@@ -125,8 +181,8 @@
 
 - name: Unmap a client role from client service account
   vars:
-    - roles:
-        - name: '{{ role }}'
+    roles:
+      - name: '{{ role }}'
   community.general.keycloak_user_rolemapping:
     auth_keycloak_url: "{{ url }}"
     auth_realm: "{{ admin_realm }}"
diff --git a/tests/integration/targets/keycloak_user_rolemapping/vars/main.yml b/tests/integration/targets/keycloak_user_rolemapping/vars/main.yml
index 385dbea44a..90122ba96c 100644
--- a/tests/integration/targets/keycloak_user_rolemapping/vars/main.yml
+++ b/tests/integration/targets/keycloak_user_rolemapping/vars/main.yml
@@ -9,6 +9,7 @@ admin_user: admin
 admin_password: password
 realm: myrealm
 client_id: myclient
+client_id_2: myotherclient
 role: myrole
 description_1: desc 1
 description_2: desc 2