UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.62 Safari/537.36

Steps to reproduce the problem:
1. Load local HTML file
2. Open Developer Tools
3. Click Sources and select loaded HTML file

What is the expected behavior?
Source-Code is displayed in tab

What went wrong?
tab is blank

Did this work before? N/A 

Chrome version: 62.0.3202.62  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Flash Player disabled

When debugging Developer Tools with CTRL+Shift+I:
inspector.js:405 Uncaught (in promise) TypeError: Cannot read property 'indexOf' of null
    at Object.TextUtils.isMinified (inspector.js:405)
    at Sources.JavaScriptSourceFrame._detectMinified (sources_module.js:505)
    at Sources.JavaScriptSourceFrame.onTextEditorContentSet (sources_module.js:503)
    at Sources.JavaScriptSourceFrame.setContent (source_frame_module.js:194)
    at <anonymous>

fields of isMinifed: text is null, lastPosition is 0

going upward to the callee of the isMinifed-method:

this.uiSourceCode().
_content:null
_contentLoaded:true
_contentType:Common.ResourceType
_category:Common.ResourceCategory {title: "Documents", shortTitle: "Doc"}
_isTextType:true
_name:"document"
 

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