diff --git a/lib/protocol/network.js b/lib/protocol/network.js
index 62e8fdb8c..03f654974 100644
--- a/lib/protocol/network.js
+++ b/lib/protocol/network.js
@@ -131,9 +131,12 @@ class Network {
   static create(options) {
     if (typeof options === 'string')
       options = networks[options];
-
+    
+    if(options instanceof Object)
+      assert(!options.type, 'Unknown network.');
+    
     assert(options, 'Unknown network.');
-
+    
     if (Network[options.type])
       return Network[options.type];