From d064dfc21a1fbd7ff3eedcc13f64f2e4b843bdfe Mon Sep 17 00:00:00 2001
From: Jack <xhzengAIB@gmail.com>
Date: Wed, 14 May 2014 08:27:02 +0800
Subject: [PATCH] Fix the block bug.

---
 MessageDisplayKit/Classes/Common/XHVoiceRecordHelper.m | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/MessageDisplayKit/Classes/Common/XHVoiceRecordHelper.m b/MessageDisplayKit/Classes/Common/XHVoiceRecordHelper.m
index 6246514..72a30b3 100644
--- a/MessageDisplayKit/Classes/Common/XHVoiceRecordHelper.m
+++ b/MessageDisplayKit/Classes/Common/XHVoiceRecordHelper.m
@@ -221,7 +221,9 @@ - (void)_updateMeters {
         if (!_isPause) {
             float progress = self.currentTimeInterval / self.maxRecordTime * 1.0;
             dispatch_async(dispatch_get_main_queue(), ^{
-                _recordProgress(progress);
+                if (_recordProgress) {
+                    _recordProgress(progress);
+                }
             });
         }