diff --git a/common/kernel/basectx.h b/common/kernel/basectx.h
index c8791a2b..7ff18228 100644
--- a/common/kernel/basectx.h
+++ b/common/kernel/basectx.h
@@ -213,7 +213,9 @@ struct BaseCtx
 
     NetInfo *getNetByAlias(IdString alias) const
     {
-        return nets.count(alias) ? nets.at(alias).get() : nets.at(net_aliases.at(alias)).get();
+        if(nets.count(alias) > 0) return nets.at(alias).get();
+        if(net_aliases.count(alias) == 0) return nullptr;
+        return nets.at(net_aliases.at(alias)).get();
     }
 
     // Intended to simplify Python API