From 5ce87b72537ae9b6dca73159549444bd4f28e186 Mon Sep 17 00:00:00 2001
From: Nikita Stupin <18281368+nikitastupin@users.noreply.github.com>
Date: Sun, 3 May 2020 10:28:43 +0300
Subject: Assert viewmode not None

---
 mitmproxy/contentviews/__init__.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mitmproxy/contentviews/__init__.py b/mitmproxy/contentviews/__init__.py
index 063b8cfe..f5c31eef 100644
--- a/mitmproxy/contentviews/__init__.py
+++ b/mitmproxy/contentviews/__init__.py
@@ -121,6 +121,9 @@ def get_tcp_content_view(viewname: str, data: bytes):
     if not viewmode:
         viewmode = get("auto")
 
+    # https://github.com/mitmproxy/mitmproxy/pull/3970#issuecomment-623024447
+    assert viewmode
+
     description, lines, error = get_content_view(viewmode, data)
 
     return description, lines, error
-- 
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