diff --git a/scripts/prd.gd b/scripts/prd.gd
index 89e41a4..7809ffd 100644
--- a/scripts/prd.gd
+++ b/scripts/prd.gd
@@ -349,9 +349,15 @@ func on_data_capsrpb_received(unit: capsrpb.CapsRpb):
     var msfs = unit.json_dic['msfs']
     for fs in msfs:
         if fs is Dictionary:
-            if not fs.has('nmfs'): return
+            if not fs.has('nmfs'):
+                return
             var nmfs = int(fs['nmfs'])
-            var fs_module = fs_dict[fs_caps_id[nmfs]]
+            if not fs_caps_id.has(nmfs):
+                continue
+            var ii = fs_caps_id[nmfs]
+            if not fs_dict.has(ii):
+                continue
+            var fs_module = fs_dict[ii]
             if fs.has('isg'):
                 fs_module.isg = int(fs['isg'])
             if fs.has('pow'):