Uncaught node.js Error when insert video or audio file

[fish520]

I got an error and the process was not closed successfully (though the window disappers but it not able to open it again since it still exists in the tasklist), whenever i try to insert a audio or video file into the paragraph.

Uncaught node.js Error 

TypeError: Cannot read property 'start' of null
    at _deleteSelection (C:\Program Files (x86)\Substance Composer\node_modules\substance-editor\src\editor_controller.js:734:29)
    at _insertNode (C:\Program Files (x86)\Substance Composer\node_modules\substance-editor\src\editor_controller.js:525:14)
    at _insertNode (C:\Program Files (x86)\Substance Composer\node_modules\substance-editor\src\editor_controller.js:570:12)
    at eval (C:\Program Files (x86)\Substance Composer\src\writer_controller.js:838:18)
    at eval (C:\Program Files (x86)\Substance Composer\src\writer_controller.js:1025:7)
    at _finally (C:\Program Files (x86)\Substance Composer\node_modules\substance-util\src\async.js:12:62)
    at eval (C:\Program Files (x86)\Substance Composer\node_modules\underscore\underscore.js:724:19)
    at process (C:\Program Files (x86)\Substance Composer\node_modules\substance-util\src\async.js:33:16)
    at eval (C:\Program Files (x86)\Substance Composer\node_modules\substance-util\src\async.js:51:7)
    at eval (C:\Program Files (x86)\Substance Composer\node_modules\underscore\underscore.js:724:19)

running on win10-x64, intel-i5 with beta3.