diff --git a/src/squint/core.js b/src/squint/core.js
index 40b6a41d..e1120540 100644
--- a/src/squint/core.js
+++ b/src/squint/core.js
@@ -412,8 +412,10 @@ export function get(coll, key, otherwise = undefined) {
       // we choose .get as the default implementation, e.g. fetch Headers are not Maps, but do implement a .get method
       let g = coll['get'];
       if (g instanceof Function) {
+        try {
         v = coll.get(key);
-        break;
+          break;
+        } catch (e) {}
       }
       v = coll[key];
       break;