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-rw-r--r--src/fields/Doc.ts1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/fields/Doc.ts b/src/fields/Doc.ts
index ffb1bbf83..fdea47c84 100644
--- a/src/fields/Doc.ts
+++ b/src/fields/Doc.ts
@@ -36,6 +36,7 @@ export namespace Field {
export function toScriptString(field: Field): string {
if (typeof field === "string") return `"${field}"`;
if (typeof field === "number" || typeof field === "boolean") return String(field);
+ if (field === undefined || field === null) return "null";
return field[ToScriptString]();
}
export function toString(field: Field): string {