diff --git a/Tusker/Caching/ImageCache.swift b/Tusker/Caching/ImageCache.swift
index 38f79435..2441b5e6 100644
--- a/Tusker/Caching/ImageCache.swift
+++ b/Tusker/Caching/ImageCache.swift
@@ -42,13 +42,18 @@ class ImageCache {
            // of the state (unknown/exists/does not exist) of whether or not objects exist on disk so that the slow, disk I/O
            // path can be avoided most of the time
            let entry = try? cache.get(key) {
-            backgroundQueue.async {
-                completion?(entry.data, entry.image)
+            if let completion = completion {
+                backgroundQueue.async {
+                    completion(entry.data, entry.image)
+                }
             }
             return nil
         } else {
-            if let completion = completion, let group = groups[url] {
-                return group.addCallback(completion)
+            if let group = groups[url] {
+                if let completion = completion {
+                    return group.addCallback(completion)
+                }
+                return nil
             } else {
                 let group = RequestGroup(url: url) { (data, image) in
                     if let data = data {