diff --git a/lib/session/call-session.js b/lib/session/call-session.js
index 6b7edc77..e32dd4d0 100644
--- a/lib/session/call-session.js
+++ b/lib/session/call-session.js
@@ -1333,6 +1333,10 @@ Duration=${duration} `
 
   _preCacheAudio(newTasks) {
     for (const task of newTasks) {
+      if (task.name === TaskName.Config && task.hasSynthesizer) {
+        /* if they change synthesizer settings don't try to precache */
+        break;
+      }
       if (task.name === TaskName.Say) {
         /* identify vendor language, voice, and label */
         const vendor = task.synthesizer.vendor && task.synthesizer.vendor !== 'default' ?