Don't call callback if it's not a function

1 files changed, 16 insertions, 3 deletions

diff --git a/lib/html_script_finder/web_labels/script_hash_worker.js b/lib/html_script_finder/web_labels/script_hash_worker.js
index a8b2fdb..92ffb82 100644
--- a/lib/html_script_finder/web_labels/script_hash_worker.js
+++ b/lib/html_script_finder/web_labels/script_hash_worker.js
@@ -49,15 +49,28 @@ exports.addToCache = function (lic, delay, jsWebLabelsURL, callback) {
                     lic.fileUrl
                 );
                 console.debug('returning xhr from', lic.fileUrl);
-                callback(lic.fileUrl);
+                if (typeof callback === 'function') {
+                    callback(lic.fileUrl);
+                } else {
+                    console.debug('callback is not a function:', callback);
+                }
             } catch (e) {
-                callback(lic.fileUrl);
+                if (typeof callback === 'function') {
+                    callback(lic.fileUrl);
+                } else {
+                    console.debug('callback is not a function:', callback);
+                }
             }
         };
         // just callback after 5 seconds if we don't get the answer yet.
         timers.setTimeout(function() {
             cb = function() {};
-            callback(lic.fileUrl); }, 20000);
+            if (typeof callback === 'function') {
+                callback(lic.fileUrl);
+            } else {
+                console.debug('callback is not a function:', callback);
+            }
+        }, 20000);
 
         xhr({'url': lic.fileUrl}, cb);
     }, delay);