diff --git a/node.bittrex.api.js b/node.bittrex.api.js
index 105292e..4183fa7 100644
--- a/node.bittrex.api.js
+++ b/node.bittrex.api.js
@@ -64,6 +64,11 @@ var NodeBittrexApi = function(options) {
     var o = Object.keys(options),
       i;
     for (i = 0; i < o.length; i++) {
+      // Warn about any undefined options we've passed, to avoid strange errors in further calls
+      if (options[o[i]] === undefined) {
+        console.error("Warning: You've passed " + options[o[i]] + " for the " + opts[o[i]] + " option, is this intended?")
+      }
+
       opts[o[i]] = options[o[i]];
     }
   };