diff --git a/server/proxy/channels/pf_channel_rdpdr.c b/server/proxy/channels/pf_channel_rdpdr.c
index 2aeeb92aa..2aa92b771 100644
--- a/server/proxy/channels/pf_channel_rdpdr.c
+++ b/server/proxy/channels/pf_channel_rdpdr.c
@@ -1663,7 +1663,8 @@ static BOOL filter_smartcard_device_list_announce(pf_channel_server_context* rdp
 			return TRUE;
 		if (DeviceType == RDPDR_DTYP_SMARTCARD)
 		{
-			ArrayList_Append(rdpdr->blockedDevices, (void*)(size_t)DeviceId);
+			if (!ArrayList_Append(rdpdr->blockedDevices, (void*)(size_t)DeviceId))
+				return FALSE;
 			if (count == 1)
 				return TRUE;