diff --git a/dist/js/entity/in_memory.js b/dist/js/entity/in_memory.js
index 7160e75..fc7ea31 100644
--- a/dist/js/entity/in_memory.js
+++ b/dist/js/entity/in_memory.js
@@ -70,8 +70,9 @@ class InMemoryEntity {
      * @summary Return a prop or the default
      */
     prop(name, defaultValue) {
+        var _a;
         // `lodash.get` gets `null` when the value is `null`, but we still want a default value in this case, hence `||`
-        return (0, get_1.default)(this._json, name, defaultValue) || defaultValue;
+        return (_a = (0, get_1.default)(this._json, name, defaultValue)) !== null && _a !== void 0 ? _a : defaultValue;
     }
     /**
      * @summary Return a required prop, throwing an error if it doesn't exist or is undefined/null
diff --git a/src/js/entity/in_memory.ts b/src/js/entity/in_memory.ts
index 7d9fd6d..e440387 100644
--- a/src/js/entity/in_memory.ts
+++ b/src/js/entity/in_memory.ts
@@ -61,7 +61,7 @@ export class InMemoryEntity implements BaseInMemoryEntitySchema {
      */
     prop<T = undefined>(name: string, defaultValue?: T): T | undefined {
         // `lodash.get` gets `null` when the value is `null`, but we still want a default value in this case, hence `||`
-        return (getValue(this._json, name, defaultValue) as T) || defaultValue;
+        return (getValue(this._json, name, defaultValue) as T) ?? defaultValue;
     }
 
     /**