diff --git a/SDAVAssetExportSession.m b/SDAVAssetExportSession.m
index 6fcd6c2..a8da0fb 100755
--- a/SDAVAssetExportSession.m
+++ b/SDAVAssetExportSession.m
@@ -289,7 +289,7 @@ - (AVMutableVideoComposition *)buildDefaultVideoComposition
         if (videoCompressionProperties)
         {
             NSNumber *frameRate = [videoCompressionProperties objectForKey:AVVideoAverageNonDroppableFrameRateKey];
-            if (frameRate)
+            if ([frameRate boolValue])
             {
                 trackFrameRate = frameRate.floatValue;
             }