crystal warning

Exception: Error writing file: Broken pipe (Errno)
0x51e717: *CallStack::unwind:Array(Pointer(Void)) at ??
0x55db7c: unbuffered_write at /opt/crystal/src/io/file_descriptor.cr 274:11
0x55fe35: write at /opt/crystal/src/io/buffered.cr 130:14
0x5e111d: unbuffered_write at /opt/crystal/src/http/server/response.cr 179:11
0x5e199b: flush at /opt/crystal/src/io/buffered.cr 186:5
0x5dfa4f: write at /opt/crystal/src/io/buffered.cr 134:7
0x5d9026: write at /opt/crystal/src/http/server/response.cr 68:7
0x5ab98a: copy at /opt/crystal/src/io.cr 1158:7
0x6da9c0: multipart at /helpers.cr 166:5
0x51924e: send_file at /home/ayam/Documents/kafarahapp/educode/lib/kemal/src/kemal/helpers/helpers.cr 102:12
0x6af534: call at /home/ayam/Documents/kafarahapp/educode/lib/kemal/src/kemal/static_file_handler.cr 54:9
0x6ae5c0: call_next at /opt/crystal/src/http/server/handler.cr 24:7
0x6ae0a0: call at /home/ayam/Documents/kafarahapp/educode/lib/kemal/src/kemal/common_exception_handler.cr 9:9
0x6ad636: call_next at /opt/crystal/src/http/server/handler.cr 24:7
0x6aa021: call at /home/ayam/Documents/kafarahapp/educode/lib/kemal/src/kemal/common_log_handler.cr 13:35
0x63ee2b: call_next at /opt/crystal/src/http/server/handler.cr 24:7
0x63ea15: call at /home/ayam/Documents/kafarahapp/educode/lib/kemal/src/kemal/init_handler.cr 11:7
0x6cc5e0: process at /opt/crystal/src/http/server/request_processor.cr 39:11
0x6cbee9: process at /opt/crystal/src/http/server/request_processor.cr 16:3
0x6c6329: handle_client at /opt/crystal/src/http/server.cr 191:5
0x519d03: ~procProc(Nil) at /home/ayam/Documents/kafarahapp/educode/lib/kemal/src/kemal/helpers/helpers.cr 105:7
0x538464: run at /opt/crystal/src/fiber.cr 255:3
0x4f33b6: ~proc2Proc(Fiber, (IO::FileDescriptor | Nil)) at /opt/crystal/src/concurrent.cr 61:3
0x0: ??? at ??

Unhandled exception in spawn:
Error writing file: Broken pipe (Errno)
0x66963c: unbuffered_write at /opt/crystal/src/io/file_descriptor.cr 274:11
0x66926b: flush at /opt/crystal/src/io/buffered.cr 186:5
0x6691d0: close at /opt/crystal/src/io/buffered.cr 194:5
0x6d6bce: process at /opt/crystal/src/http/server/request_processor.cr 65:7
0x6cbee9: process at /opt/crystal/src/http/server/request_processor.cr 16:3
0x6c6329: handle_client at /opt/crystal/src/http/server.cr 191:5
0x519d03: ~procProc(Nil) at /home/ayam/Documents/kafarahapp/educode/lib/kemal/src/kemal/helpers/helpers.cr 105:7
0x538464: run at /opt/crystal/src/fiber.cr 255:3
0x4f33b6: ~proc2Proc(Fiber, (IO::FileDescriptor | Nil)) at /opt/crystal/src/concurrent.cr 61:3
0x0: ??? at ??
2017-06-25 19:42:29 +0700 304 GET /uploads/images/jihantoro.jpeg 83.2µs
2017-06-25 19:42:29 +0700 304 GET /david.jpg 60.1µs
2017-06-25 19:42:29 +0700 304 GET /uploads/images/vuessr.jpg 68.1µs