Do not access WebInspector.panels.scripts panel while it's disabled in Chrome...

third_party/WebKit/WebCore/inspector/front-end/Console.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer. 
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 249 matching lines @@
         var result;
         if (expressionString) {
             try {
                 result = this._evalInInspectedWindow(expressionString);
             } catch(e) {
                 // Do nothing, the prefix will be considered a window property.
             }
         } else {
             // There is no expressionString, so the completion should happen against global properties.
             // Or if the debugger is paused, against properties in scope of the selected call frame.
-            if (WebInspector.panels.scripts.paused)
+            if (WebInspector.panels.scripts && WebInspector.panels.scripts.paused)
                 result = WebInspector.panels.scripts.variablesInScopeForSelectedCallFrame();
             else
                 result = InspectorController.inspectedWindow();
         }
 
         if (bracketNotation) {
             if (prefix.length && prefix[0] === "'")
                 var quoteUsed = "'";
             else
                 var quoteUsed = "\"";
@@ skipping 106 matching lines @@
     {
         WebInspector.elementDragEnd(event);
 
         delete this._statusBarDragOffset;
 
         event.stopPropagation();
     },
 
     _evalInInspectedWindow: function(expression)
     {
-        if (WebInspector.panels.scripts.paused)
+        if (WebInspector.panels.scripts && WebInspector.panels.scripts.paused)
             return WebInspector.panels.scripts.evaluateInSelectedCallFrame(expression);
-
         var inspectedWindow = InspectorController.inspectedWindow();
         if (!inspectedWindow._inspectorCommandLineAPI) {
             inspectedWindow.eval("window._inspectorCommandLineAPI = { \
                 $: function() { return document.getElementById.apply(document, arguments) }, \
                 $$: function() { return document.querySelectorAll.apply(document, arguments) }, \
                 $x: function(xpath, context) { \
                     var nodes = []; \
                     try { \
                         var doc = context || document; \
                         var results = doc.evaluate(xpath, doc, null, XPathResult.ANY_TYPE, null); \
@@ skipping 519 matching lines @@
                     groupElement.removeStyleClass("collapsed");
                 else
                     groupElement.addStyleClass("collapsed");
             groupTitleElement.scrollIntoViewIfNeeded(true);
         }
 
         event.stopPropagation();
         event.preventDefault();
     }
 }