diff --git a/phpBB/includes/acp/acp_groups.php b/phpBB/includes/acp/acp_groups.php
index 847ccfb3cc..c79699d465 100644
--- a/phpBB/includes/acp/acp_groups.php
+++ b/phpBB/includes/acp/acp_groups.php
@@ -591,7 +591,7 @@ class acp_groups
 
 				$avatar = phpbb_get_group_avatar($group_row, 'GROUP_AVATAR', true);
 
-				if (!$update)
+				if (isset($phpbb_avatar_manager) && !$update)
 				{
 					// Merge any avatar errors into the primary error array
 					$error = array_merge($error, $phpbb_avatar_manager->localize_errors($user, $avatar_error));
diff --git a/phpBB/includes/ucp/ucp_groups.php b/phpBB/includes/ucp/ucp_groups.php
index af08533a7d..aada0525a8 100644
--- a/phpBB/includes/ucp/ucp_groups.php
+++ b/phpBB/includes/ucp/ucp_groups.php
@@ -691,7 +691,7 @@ class ucp_groups
 							}
 						}
 
-						if (!$update)
+						if (isset($phpbb_avatar_manager) && !$update)
 						{
 							// Merge any avatars errors into the primary error array
 							$error = array_merge($error, $phpbb_avatar_manager->localize_errors($user, $avatar_error));