Scrolling to load lazy content: javascript execute not allowed everywhere

[Sebisnow]

INFO in downloader [/home/ubuntu/StampTheWeb/app/main/downloader.py:213]:

Downloaded url, start scrolling.

---

ERROR in downloader [/home/ubuntu/StampTheWeb/app/main/downloader.py:594]:

Internal System Error: Can't convert 'tuple' object to str implicitly("Can't convert 'tuple' object to str implicitly",)

Traceback (most recent call last):
File "/home/ubuntu/StampTheWeb/app/main/downloader.py", line 654, in save_render_zip_submit
create_png_from_url(url, sha256)
File "/home/ubuntu/StampTheWeb/app/main/downloader.py", line 214, in create_png_from_url
d_thread.DownloadThread.scroll(phantom)
File "/home/ubuntu/StampTheWeb/app/main/download_thread.py", line 412, in scroll
last_height = phantom.execute_script("return document.body.scrollHeight")
File "/usr/local/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py", line 465, in execute_script
'args': converted_args})['value']
File "/usr/local/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py", line 236, in execute
self.error_handler.check_response(response)
File "/usr/local/lib/python3.5/site-packages/selenium/webdriver/remote/errorhandler.py", line 192, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: {"errorMessage":"Refused to evaluate a string as JavaScript because 'unsafe-eval' is not an allowed source of script in the following Content Security Policy directive: "script-src 'self' 'sha256-dOEkAci/oPxf5KnvZSDGW6/1gs5qvj7uG++2KYd+qd4='".\n","request":{"headers":{"Accept":"application/json","Accept-Encoding":"identity","Connection":"close","Content-Length":"112","Content-Type":"application/json;charset=UTF-8","Host":"127.0.0.1:42911","User-Agent":"Python-urllib/3.5"},"httpVersion":"1.1","method":"POST","post":"{"sessionId": "885ee7e0-8bc8-11e6-966d-15b4ebe12c58", "script": "return document.body.scrollHeight", "args": []}","url":"/execute","urlParsed":{"anchor":"","query":"","file":"execute","directory":"/","path":"/execute","relative":"/execute","port":"","host":"","password":"","user":"","userInfo":"","authority":"","protocol":"","source":"/execute","queryKey":{},"chunks":["execute"]},"urlOriginal":"/session/885ee7e0-8bc8-11e6-966d-15b4ebe12c58/execute"}}
Screenshot: available via screen

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/ubuntu/StampTheWeb/app/main/downloader.py", line 587, in get_url_history
originstamp_result = save_render_zip_submit(html_text, sha256, url, title)
File "/home/ubuntu/StampTheWeb/app/main/downloader.py", line 670, in save_render_zip_submit
'\n Originstamp Result was: ' + str(originstamp_result.status_code), 'error')
TypeError: Can't convert 'tuple' object to str implicitly