Hi, greetings! I was trying out some examples from the Pharo By Example book on the latest development version of Pharo, and I wanted to create a stand-alone window for a simple game on Ubuntu. So I found out the openInExternalWindow method, the window appears but I get this error that I couldn't understand, and could not find any reference to it online. So I'm not sure if it's a bug. The simplest way I found to reproduce it was: 'Hello' asMorph openInExternalWindow. I'm using Pharo 7 on Ubuntu 17.10. A copy of the stack: ByteArray(Object)>>primitiveFailed: ByteArray(Object)>>primitiveFailed ByteArray>>integerAt:size:signed: ByteArray>>unsignedLongAt: SDL_KeyDownEvent>>windowID OSSDL2Driver>>convertEvent: [ event := self convertEvent: sdlEvent. event ifNotNil: [ eventQueue nextPut: event ] ] in OSSDL2Driver>>processEvent: in Block: [ event := self convertEvent: sdlEvent.... BlockClosure>>on:do: OSSDL2Driver>>processEvent: OSSDL2Driver>>eventLoopProcessWithoutPlugin [ self eventLoopProcessWithoutPlugin ] in OSSDL2Driver>>setupEventLoop in Block: [ self eventLoopProcessWithoutPlugin ] [ self value. Processor terminateActive ] in BlockClosure>>newProcess in Block: [ self value.... But it seems incomplete. Any more information I can provide? Thank you.