diff --git a/DCTar.m b/DCTar.m
index 87abf33..237963b 100644
--- a/DCTar.m
+++ b/DCTar.m
@@ -312,10 +312,11 @@ +(BOOL)untarObject:(id)tarObject size:(unsigned long long)size toPath:(NSString*
                 //NSLog(@"file created: %@",name);
                 
                 if(size == 0) {
-                    [@"" writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:error];
+                    [@"" writeToFile:filePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
+                } else {
+                    blockCount += (size - 1) / TAR_BLOCK_SIZE + 1; // size/TAR_BLOCK_SIZE rounded up
                 }
                 
-                blockCount += (size - 1) / TAR_BLOCK_SIZE + 1; // size/TAR_BLOCK_SIZE rounded up
                 [self writeFileDataForObject:tarObject atLocation:(location + TAR_BLOCK_SIZE) withLength:size atPath:filePath];
                 
             } else if(type == '5') {