Este mensaje aparece todo el tiempo en la consola de Chrome Developer Tool:

Port error: Could not establish connection. Receiving end does not exist. miscellaneous_bindings:232
chromeHidden.Port.dispatchOnDisconnect miscellaneous_bindings:232
Error in event handler for 'undefined': Cannot read property 'instanceId' of undefined TypeError: Cannot read property 'instanceId' of undefined
    at [object Object].<anonymous> (chrome-extension://mgijmajocgfcbeboacabfgobmjgjcoja/content_js_min.js:2:372)
    at chrome-extension://mgijmajocgfcbeboacabfgobmjgjcoja/content_js_min.js:1:182
    at miscellaneous_bindings:276:11
    at [object Object].dispatch (event_bindings:203:41)
    at Object.<anonymous> (miscellaneous_bindings:235:27) event_bindings:207
chrome.Event.dispatch event_bindings:207
chromeHidden.Port.dispatchOnDisconnect miscellaneous_bindings:235

¿es esto un error en Chrome o hay algo mal en mi instalación de Chrome?