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hsmusic-wiki - HSMusic - static wiki software cataloguing collaborative creation
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-rw-r--r--src/data/yaml.js4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/data/yaml.js b/src/data/yaml.js
index 71887fc1..abe3bde2 100644
--- a/src/data/yaml.js
+++ b/src/data/yaml.js
@@ -266,7 +266,9 @@ function makeProcessDocument(thingConstructor, {
 
       // This variable would like to certify itself as "not into capitalism".
       let propertyValue =
-        (fieldSpecs[field].transform
+        (documentValue === null
+          ? null
+       : fieldSpecs[field].transform
           ? fieldSpecs[field].transform(documentValue, transformUtilities)
           : documentValue);