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-rw-r--r--mitmproxy/optmanager.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/mitmproxy/optmanager.py b/mitmproxy/optmanager.py
index 6e187b0d..f42aa645 100644
--- a/mitmproxy/optmanager.py
+++ b/mitmproxy/optmanager.py
@@ -551,7 +551,9 @@ def serialize(opts: OptManager, text: str, defaults: bool = False) -> str:
for k in list(data.keys()):
if k not in opts._options:
del data[k]
- return ruamel.yaml.round_trip_dump(data)
+ ret = ruamel.yaml.round_trip_dump(data)
+ assert ret
+ return ret
def save(opts: OptManager, path: str, defaults: bool =False) -> None: