possible fix for AFURLSessionManager

@@ -196,10 +196,24 @@ didCompleteWithError:(NSError *)error
 
     //Performance Improvement from #2672
     NSData *data = nil;
-    if (self.mutableData) {
-        data = [self.mutableData copy];
-        //We no longer need the reference, so nil it out to gain back some memory.
-        self.mutableData = nil;
+//    if (self.mutableData) {
+//        data = [self.mutableData copy];
+//        //We no longer need the reference, so nil it out to gain back some memory.
+//        self.mutableData = nil;
+//    }
+    
+    @try {
+        if (self.mutableData) {
+            data = [self.mutableData copy];
+            //We no longer need the reference, so nil it out to gain back some memory.
+            self.mutableData = nil;
+        }
+    }
+    @catch (NSException *exception) {
+       NSLog(@"delegate URLSession inner error: %@", exception.reason);
+    }
+    @finally {
+//           NSLog(@"Finally condition");
     }
 
     if (self.downloadFileURL) {
@@ -1050,7 +1064,16 @@ didCompleteWithError:(NSError *)error
 
     // delegate may be nil when completing a task in the background
     if (delegate) {
-        [delegate URLSession:session task:task didCompleteWithError:error];
+//        [delegate URLSession:session task:task didCompleteWithError:error];
+        @try {
+            [delegate URLSession:session task:task didCompleteWithError:error];
+        }
+        @catch (NSException *exception) {
+           NSLog(@"delegate URLSession error: %@", exception.reason);
+        }
+        @finally {
+    //           NSLog(@"Finally condition");
+        }
 
         [self removeDelegateForTask:task];
     }