diff --git a/ios/RNCAssetsLibraryRequestHandler.m b/ios/RNCAssetsLibraryRequestHandler.m
index 82ee4c0..c1f1778 100644
--- a/ios/RNCAssetsLibraryRequestHandler.m
+++ b/ios/RNCAssetsLibraryRequestHandler.m
@@ -101,7 +101,7 @@ RCT_EXPORT_MODULE()
                                                               MIMEType:(__bridge NSString *)(mimeType)
                                                  expectedContentLength:length
                                                       textEncodingName:nil];
-    CFRelease(mimeType);
+    if(mimeType) CFRelease(mimeType);
     
     [delegate URLRequest:cancellationBlock didReceiveResponse:response];