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## Description

<!-- The brief description of the potential bug. -->

IOS Weex SDK Crash

Our application is crashing in production because of the below bug.
we are using 0.18.0 version of weex ios SDK. Please see the stack below.


Crashed: com.taobao.weex.component
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000018

Crashed: com.taobao.weex.component
0  Paytm                          0x1039253f4 wx_layoutNode (Layout.c:990)
1  Paytm                          0x1039253f4 wx_layoutNode (Layout.c:990)
2  Paytm                          0x103942db8 -[WXComponentManager _layout] 
(WXComponentManager.m:820)
3  Paytm                          0x103942c78 -[WXComponentManager 
_layoutAndSyncUI] (WXComponentManager.m:789)
4  Paytm                          0x10393f33c -[WXComponentManager 
_recursivelyAddComponent:toSupercomponent:atIndex:appendingInTree:] 
(WXComponentManager.m:310)
5  Paytm                          0x10393efc0 -[WXComponentManager 
addComponent:toSupercomponent:atIndex:appendingInTree:] 
(WXComponentManager.m:269)
6  Paytm                          0x103939110 __42-[WXBridgeContext 
registerGlobalFunctions]_block_invoke_2 (WXBridgeContext.m:139)
7  Paytm                          0x10393dec8 +[WXComponentManager 
_performBlockOnComponentThread:] (WXComponentManager.m:130)
8  Foundation                     0x185a4e0ec __NSThreadPerformPerform + 340
9  CoreFoundation                 0x184fab404 
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
10 CoreFoundation                 0x184faac2c __CFRunLoopDoSources0 + 276
11 CoreFoundation                 0x184fa879c __CFRunLoopRun + 1204
12 CoreFoundation                 0x184ec8da8 CFRunLoopRunSpecific + 552
13 Foundation                     0x18593d674 -[NSRunLoop(NSRunLoop) 
runMode:beforeDate:] + 304
14 Paytm                          0x10393ddac -[WXComponentManager 
_runLoopThread] (WXComponentManager.m:122)
15 Foundation                     0x185a4defc __NSThread__start__ + 1040
16 libsystem_pthread.dylib        0x184c29220 _pthread_body + 272
17 libsystem_pthread.dylib        0x184c29110 _pthread_body + 290
18 libsystem_pthread.dylib        0x184c27b10 thread_start + 4

## Environment

<!-- The environment to reproduce this bug, such as **Weex Version** and 
**Device Mode**. -->
<!-- You can get the environment of your device by [this 
example](http://dotwe.org/vue/1dea64f527db3fd109c0fb682d41c14f). -->
iPhone, OS : 11.4.1

## Broken Example

<!-- Please offer an example on the [online editor of Weex](http://dotwe.org/) 
to reproduce this bug. -->

## Steps to Reproduce

<!-- Clear and concise steps to reproduce this bug. -->


[ Full content available at: 
https://github.com/apache/incubator-weex/issues/1578 ]
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