diff --git a/lib/devices/ios/remote-debugger.js b/lib/devices/ios/remote-debugger.js
index 8f206dec0..2996a22c2 100644
--- a/lib/devices/ios/remote-debugger.js
+++ b/lib/devices/ios/remote-debugger.js
@@ -97,7 +97,7 @@ RemoteDebugger.prototype.disconnect = function () {
 };
 
 RemoteDebugger.prototype.setConnectionKey = function (cb) {
-  assert.ok(this.connId);
+  try { assert.ok(this.connId); } catch (err) { return cb(err); }
   var setConnKey = messages.setConnectionKey(this.connId);
   this.logger.info("Sending connection key");
   this.send(setConnKey, function (simNameKey, simBuildKey) {
@@ -113,7 +113,7 @@ RemoteDebugger.prototype.setConnectionKey = function (cb) {
 };
 
 RemoteDebugger.prototype.selectApp = function (appIdKey, cb) {
-  assert.ok(this.connId);
+  try { assert.ok(this.connId); } catch (err) { return cb(err); }
   this.appIdKey = appIdKey;
   var connectToApp = messages.connectToApp(this.connId, this.appIdKey);
   this.logger.info("Selecting app");
@@ -140,9 +140,12 @@ RemoteDebugger.prototype.selectPage = function (pageIdKey, cb, skipReadyCheck) {
   if (typeof skipReadyCheck === "undefined") {
     skipReadyCheck = false;
   }
-  assert.ok(this.connId);
-  assert.ok(this.appIdKey);
-  assert.ok(this.senderId);
+  try {
+    assert.ok(this.connId);
+    assert.ok(this.appIdKey);
+    assert.ok(this.senderId);
+  } catch (err) { return cb(err); }
+
   this.pageIdKey = pageIdKey;
   var setSenderKey = messages.setSenderKey(this.connId, this.appIdKey,
                                            this.senderId, this.pageIdKey);
@@ -269,10 +272,12 @@ RemoteDebugger.prototype.execute = function (command, cb, override) {
     }.bind(this));
   } else {
     if (this.debuggerType === this.debuggerTypeEnum.webinspector) {
-      assert.ok(this.connId);
-      assert.ok(this.appIdKey);
-      assert.ok(this.senderId);
-      assert.ok(this.pageIdKey);
+      try {
+        assert.ok(this.connId);
+        assert.ok(this.appIdKey);
+        assert.ok(this.senderId);
+        assert.ok(this.pageIdKey);
+      } catch (err) { return cb(err); }
     }
     this.logger.info("Sending javascript command");
     var sendJSCommand = messages.sendJSCommand(command, this.appIdKey,
@@ -282,10 +287,13 @@ RemoteDebugger.prototype.execute = function (command, cb, override) {
 };
 
 RemoteDebugger.prototype.callFunction = function (objId, fn, args, cb) {
-  assert.ok(this.connId);
-  assert.ok(this.appIdKey);
-  assert.ok(this.senderId);
-  assert.ok(this.pageIdKey);
+  try {
+    assert.ok(this.connId);
+    assert.ok(this.appIdKey);
+    assert.ok(this.senderId);
+    assert.ok(this.pageIdKey);
+  } catch (err) { return cb(err); }
+
   this.logger.info("Calling javascript function");
   var callJSFunction = messages.callJSfunction(objId, fn, args, this.appIdKey,
       this.connId, this.senderId, this.pageIdKey, this.debuggerType);
@@ -294,10 +302,12 @@ RemoteDebugger.prototype.callFunction = function (objId, fn, args, cb) {
 
 RemoteDebugger.prototype.navToUrl = function (url, cb) {
   if (this.debuggerType === this.debuggerTypeEnum.webinspector) {
-    assert.ok(this.connId);
-    assert.ok(this.appIdKey);
-    assert.ok(this.senderId);
-    assert.ok(this.pageIdKey);
+    try {
+      assert.ok(this.connId);
+      assert.ok(this.appIdKey);
+      assert.ok(this.senderId);
+      assert.ok(this.pageIdKey);
+    } catch (err) { return cb(err); }
   }
   this.logger.info("Navigating to new URL: " + url);
   var navToUrl = messages.setUrl(url, this.appIdKey, this.connId,