diff --git a/ios/sdk/WeexSDK/Sources/Utility/WXUtility.m b/ios/sdk/WeexSDK/Sources/Utility/WXUtility.m
index 73c1108a46..6ec4223b48 100644
--- a/ios/sdk/WeexSDK/Sources/Utility/WXUtility.m
+++ b/ios/sdk/WeexSDK/Sources/Utility/WXUtility.m
@@ -268,6 +268,12 @@ + (id _Nullable)convertContainerToImmutable:(id _Nullable)source
     if ([source isKindOfClass:[NSArray class]]) {
         NSMutableArray* tmpArray = [[NSMutableArray alloc] init];
         for (id obj in source) {
+            if (obj == nil) {
+                /* srouce may be a subclass of NSArray and the subclassed
+                 array may return nil in its overridden objectAtIndex: method.
+                 So obj could be nil!!!. */
+                continue;
+            }
             [tmpArray addObject:[self convertContainerToImmutable:obj]];
         }
         id immutableArray = [NSArray arrayWithArray:tmpArray];