diff --git a/Classes/BITFeedbackMessageAttachment.m b/Classes/BITFeedbackMessageAttachment.m
index 7e8dfc1ab0..cc74cb2e89 100644
--- a/Classes/BITFeedbackMessageAttachment.m
+++ b/Classes/BITFeedbackMessageAttachment.m
@@ -220,15 +220,18 @@
   // File extension that suits the Content type.
   
   CFStringRef mimeType = (__bridge CFStringRef)self.contentType;
-  CFStringRef uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, mimeType, NULL);
-  CFStringRef extension = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassFilenameExtension);
-  if (extension) {
-    _tempFilename = [_tempFilename stringByAppendingPathExtension:(__bridge NSString *)(extension)];
-    CFRelease(extension);
+  if (mimeType) {
+    CFStringRef uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, mimeType, NULL);
+    CFStringRef extension = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassFilenameExtension);
+    if (extension) {
+      _tempFilename = [_tempFilename stringByAppendingPathExtension:(__bridge NSString *)(extension)];
+      CFRelease(extension);
+    }
+    if (uti) {
+      CFRelease(uti);
+    }
   }
   
-  CFRelease(uti);
-  
   return _tempFilename;
 }