diff --git a/ops/nixos/default.nix b/ops/nixos/default.nix
index f1103df13b..a3173f5f51 100644
--- a/ops/nixos/default.nix
+++ b/ops/nixos/default.nix
@@ -67,7 +67,7 @@ let
           };
         }];
       };
-      stockExporters = lib.mapAttrsToList (exporterName: exporter: mkExporter exporterName exporter.port) (lib.filterAttrs (exporterName: exporter: exporterName != "snmp" && exporter.enable) sys.config.services.prometheus.exporters);
+      stockExporters = lib.mapAttrsToList (exporterName: exporter: mkExporter exporterName exporter.port) (lib.filterAttrs (exporterName: exporter: builtins.isAttrs exporter && exporterName != "snmp" && exporter.enable) sys.config.services.prometheus.exporters);
       customExporters = lib.mapAttrsToList mkExporter sys.config.my.prometheus.additionalExporterPorts;
     in
       stockExporters ++ customExporters;