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-rw-r--r--pl/episode_data.pl5
1 files changed, 4 insertions, 1 deletions
diff --git a/pl/episode_data.pl b/pl/episode_data.pl
index 0246de0..af91d4e 100644
--- a/pl/episode_data.pl
+++ b/pl/episode_data.pl
@@ -87,7 +87,10 @@ maybe_assert_episode_title(Ep, Title) :-
maybe_assert_episode_datum(Ep, Key, Value) :-
( episode_datum(Ep, Key, Value), !
- ; retract_episode_datum(Ep, Key, _),
+ ; ( episode_datum(Ep, Key, _)
+ -> retract_episode_datum(Ep, Key, _)
+ ; true
+ ),
assert_episode_datum(Ep, Key, Value)
).