diff --git a/src/ast.ts b/src/ast.ts
index 976d39a..a653112 100644
--- a/src/ast.ts
+++ b/src/ast.ts
@@ -279,7 +279,9 @@ export function prettyPrint(ast: AST, indent = 0): string {
                     ? `...${prettyPrint(entry.expr, indent + 1)}`
                     : `${needsQuotes(entry.key) ? JSON.stringify(entry.key) : entry.key} = ${prettyPrint(entry.value, indent + 1)}`
             );
-            if (parts.length <= 1) return `{ ${parts.join(', ')} }`;
+            const oneLine = `{ ${parts.join(', ')} }`;
+            if (oneLine.length <= 60 || parts.length <= 1) return oneLine;
+            // if (parts.length <= 1) return `{ ${parts.join(', ')} }`;
             const inner = parts.map(p => `${'  '.repeat(indent + 1)}${p}`).join(',\n');
             return `{\n${inner}\n${i}}`;
 
diff --git a/src/runtime-js.ts b/src/runtime-js.ts
index 6235707..4b1ba41 100644
--- a/src/runtime-js.ts
+++ b/src/runtime-js.ts
@@ -112,6 +112,7 @@ export const _rt = {
         let obj: any = store[path[0]];
         for (let i = 1; i < path.length; i++) {
             if (obj === undefined || obj === null) return { _tag: 'None' };
+            if (!Object.prototype.hasOwnProperty.call(obj, path[i])) return { _tag: 'None' };
             obj = obj[path[i]];
         }
         return obj === undefined ? { _tag: 'None' } : { _tag: 'Some', _0: obj };