diff --git a/Mixpanel/BindingMessage.swift b/Mixpanel/BindingMessage.swift
index d75d737..82bc112 100644
--- a/Mixpanel/BindingMessage.swift
+++ b/Mixpanel/BindingMessage.swift
@@ -26,7 +26,7 @@ class BindingRequest: BaseWebSocketMessage {
                 var bindingCollection = connection.getSessionObjectSynchronized(for: "event_bindings") as? CodelessBindingCollection
                 if bindingCollection == nil {
                     bindingCollection = CodelessBindingCollection()
-                    connection.setSessionObjectSynchronized(with: bindingCollection, for: "event_bindings")
+                    connection.setSessionObjectSynchronized(with: bindingCollection!, for: "event_bindings")
                 }
 
                 if let payload = self.payload["events"] as? [[String: Any]] {
diff --git a/Mixpanel/ChangeMessage.swift b/Mixpanel/ChangeMessage.swift
index 55b8596..ab48964 100644
--- a/Mixpanel/ChangeMessage.swift
+++ b/Mixpanel/ChangeMessage.swift
@@ -26,7 +26,7 @@ class ChangeRequest: BaseWebSocketMessage {
             var variant = connection.getSessionObjectSynchronized(for: "session_variant") as? Variant
             if variant == nil {
                 variant = Variant(ID: 0, experimentID: 0, actions: [], tweaks: [])
-                connection.setSessionObjectSynchronized(with: variant, for: "session_variant")
+                connection.setSessionObjectSynchronized(with: variant!, for: "session_variant")
             }
 
             if let actions = self.payload["actions"] as? [[String: Any]] {
diff --git a/Mixpanel/ObjectSerializer.swift b/Mixpanel/ObjectSerializer.swift
index 399c613..884a729 100644
--- a/Mixpanel/ObjectSerializer.swift
+++ b/Mixpanel/ObjectSerializer.swift
@@ -47,7 +47,7 @@ class ObjectSerializer {
                 }
             }
 
-            let delegateSelector: Selector = Selector("delegate")
+            let delegateSelector: Selector = NSSelectorFromString("delegate")
             if !classDescription.delegateInfos.isEmpty && object.responds(to: delegateSelector) {
                 let imp = object.method(for: delegateSelector)
                 typealias MyCFunction = @convention(c) (AnyObject, Selector) -> AnyObject
diff --git a/Mixpanel/ObjectSerializerConfig.swift b/Mixpanel/ObjectSerializerConfig.swift
index 2d5b3bd..e30e753 100644
--- a/Mixpanel/ObjectSerializerConfig.swift
+++ b/Mixpanel/ObjectSerializerConfig.swift
@@ -171,7 +171,7 @@ class PropertyDescription {
             predicate = NSPredicate(format: predicateFormat)
         }
 
-        let getDict = dict["get"] as? [String: Any] ?? ["selector": name,
+        let getDict = dict["get"] as? [String: Any] ?? ["selector": name ?? "😢",
                                                         "result": ["type": dict["type"],
                                                                    "name": "value"],
                                                         "parameters": []]
diff --git a/Mixpanel/SnapshotMessage.swift b/Mixpanel/SnapshotMessage.swift
index bfad555..15814ca 100644
--- a/Mixpanel/SnapshotMessage.swift
+++ b/Mixpanel/SnapshotMessage.swift
@@ -51,7 +51,7 @@ class SnapshotRequest: BaseWebSocketMessage {
             var objectIdentityProvider = connection.getSessionObjectSynchronized(for: "object_identity_provider")
             if objectIdentityProvider == nil {
                 objectIdentityProvider = ObjectIdentityProvider()
-                connection.setSessionObjectSynchronized(with: objectIdentityProvider, for: "object_identity_provider")
+                connection.setSessionObjectSynchronized(with: objectIdentityProvider!, for: "object_identity_provider")
             }
 
             let serializer = ApplicationStateSerializer(application: UIApplication.shared,
diff --git a/Mixpanel/TweakMessage.swift b/Mixpanel/TweakMessage.swift
index d09adc6..f506c46 100644
--- a/Mixpanel/TweakMessage.swift
+++ b/Mixpanel/TweakMessage.swift
@@ -26,7 +26,7 @@ class TweakRequest: BaseWebSocketMessage {
             var variant = connection.getSessionObjectSynchronized(for: "session_variant") as? Variant
             if variant == nil {
                 variant = Variant(ID: 0, experimentID: 0, actions: [], tweaks: [])
-                connection.setSessionObjectSynchronized(with: variant, for: "session_variant")
+                connection.setSessionObjectSynchronized(with: variant!, for: "session_variant")
             }
 
             if let tweaks = self.payload["tweaks"] as? [[String: Any]] {
diff --git a/Mixpanel/UIViewSelectors.swift b/Mixpanel/UIViewSelectors.swift
index d8a78a2..25772f9 100644
--- a/Mixpanel/UIViewSelectors.swift
+++ b/Mixpanel/UIViewSelectors.swift
@@ -80,7 +80,7 @@ extension UIView {
     func mp_imageFingerprint() -> String? {
         var result: String? = nil
         var originalImage: UIImage? = nil
-        let imageSelector = Selector("image")
+        let imageSelector = NSSelectorFromString("image")
 
         if let button = self as? UIButton {
             originalImage = button.image(for: UIControlState.normal)
@@ -146,7 +146,7 @@ extension UIView {
 
     func mp_text() -> String? {
         var text: String? = nil
-        let titleSelector = Selector("title")
+        let titleSelector = NSSelectorFromString("title")
         if let label = self as? UILabel {
             text = label.text
         } else if let button = self as? UIButton {
diff --git a/Mixpanel/WebSocketWrapper.swift b/Mixpanel/WebSocketWrapper.swift
index 438d8a6..ec628e1 100644
--- a/Mixpanel/WebSocketWrapper.swift
+++ b/Mixpanel/WebSocketWrapper.swift
@@ -201,7 +201,7 @@ class WebSocketWrapper: WebSocketDelegate {
         } else {
             indeterminateLayer?.removeAnimation(forKey: WebSocketWrapper.startLoadingAnimationKey)
             loadBasicAnimation(duration: 0.4,
-                               fromValue: indeterminateLayer?.presentation()?.value(forKey: "bounds.size.width"),
+                               fromValue: indeterminateLayer?.presentation()?.value(forKey: "bounds.size.width") ?? 0.0,
                                toValue: connectivityIndiciatorWindow!.bounds.size.width * 2,
                                animationKey: WebSocketWrapper.finishLoadingAnimationKey)
         }