do not convert scalar observations to boolean ones

1 files changed, 1 insertions, 1 deletions

diff --git a/bin/observations-enum-to-boolean.py b/bin/observations-enum-to-boolean.py
index fc7807c..153ee01 100755
--- a/bin/observations-enum-to-boolean.py
+++ b/bin/observations-enum-to-boolean.py
@@ -24,7 +24,7 @@ def main():
 
     for param_name, distinct_values in distinct_param_values.items():
         if len(distinct_values) > 2 and not all(
-            map(dfatool.utils.is_numeric, distinct_values)
+            map(lambda x: x is None or dfatool.utils.is_numeric(x), distinct_values)
         ):
             replace_map[param_name] = distinct_values