diff --git a/karma-tests/wombat.spec.js b/karma-tests/wombat.spec.js
index b9b64c27..d735988f 100644
--- a/karma-tests/wombat.spec.js
+++ b/karma-tests/wombat.spec.js
@@ -83,6 +83,7 @@ function runWombatTest(testCase, done) {
                 new window._WBWombat(window, wbinfo);
             });
         } catch (e) {
+            console.error(e.stack);
             throw new Error('Initializing WombatJS failed: ' + e.toString());
         }