• Forge Version: 12.18.3.2316
• Calculator Version: 3.2.1
• SonarCore Version: 3.2.6
• Multiplayer or Singleplayer: Single Player
• Crash Report Link: https://gist.github.com/yesterday17/781e415daa921dff2902b64e61310fed#file-calculator
• Affected Features: Storage Module
• Description:
  The crash happens on the server side(crash-2017-08-20_22.47.15-server). It seems that the design of storage module didn't expect the behavior of exchanging items. Surely, it can't be moved by mouse, however, it can be exchanged using number buttons 1-9 on the top of keyboard.
  It caused stack overflow error(which is easy to understand why) and crashed. After restart, the storage module disappeared. Anything left was the item exchanged with the module. Sad story(QAQ).

P.S.: Flawless Calculator may be influenced, too. It needs to check.

Sorry for my poor english. But it should be enough for bug-shooting.