[Bugfix] Fix worker crash when trying to pass Exception with postMessage

src/common/worker.js

@@ -27,6 +27,9 @@ function dispatchHandlers(packet, send){
             handleDetect(packet.payload, respond);
         }
     } catch (err) {
+        // Prepare exception to travel through postMessage
+        err = err.toString();
+
         respond.reject(err)
     }
 }