diff --git a/MSCachedAsyncViewDrawing.m b/MSCachedAsyncViewDrawing.m
index 9724841..db29db9 100644
--- a/MSCachedAsyncViewDrawing.m
+++ b/MSCachedAsyncViewDrawing.m
@@ -110,7 +110,7 @@ - (void)drawViewWithCacheKey:(NSString *)cacheKey
         }
         UIGraphicsEndImageContext();
 
-        [self.cache setObject:resultImage forKey:cacheKey];
+        if (resultImage) [self.cache setObject:resultImage forKey:cacheKey];
 
         if (waitUntilDone)
         {