diff --git a/lib/model-helper.js b/lib/model-helper.js
index 1fafcbd..1cff049 100644
--- a/lib/model-helper.js
+++ b/lib/model-helper.js
@@ -102,8 +102,8 @@ var modelHelper = module.exports = {
         generateModelDefinition(rel.modelThrough, out);
       }
     }
-    for(var rm in referencedModels) {
-      generateModelDefinition(referencedModels[rm], out);
+    for (var i = 0, n = referencedModels.length; i < n; i++) {
+      generateModelDefinition(referencedModels[i], out);
     }
     return out;
   },
diff --git a/package.json b/package.json
index 9bef826..e1cde4a 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "loopback-explorer",
-  "version": "1.2.10",
+  "version": "1.2.11",
   "description": "Browse and test your LoopBack app's APIs",
   "main": "index.js",
   "scripts": {
diff --git a/test/model-helper.test.js b/test/model-helper.test.js
index efe720a..98fd4b1 100644
--- a/test/model-helper.test.js
+++ b/test/model-helper.test.js
@@ -164,6 +164,18 @@ describe('model-helper', function() {
       expect(defs).has.property('Model5');
       expect(defs).has.property('Model6');
     });
+
+    // https://github.com/strongloop/loopback-explorer/issues/49
+    it('should work if Array class is extended and no related models are found',
+      function() {
+        var Model7 = loopback.createModel('Model7', {street: String});
+        Array.prototype.customFunc = function() {
+        };
+        var defs = modelHelper.generateModelDefinition(Model7, {});
+        expect(defs).has.property('Model7');
+        expect(Object.keys(defs)).has.property('length', 1);
+      });
+
   });
 
   describe('hidden properties', function() {