diff --git a/draftlogs/5878_fix.md b/draftlogs/5878_fix.md
new file mode 100644
index 00000000000..cd7b8f0ec6f
--- /dev/null
+++ b/draftlogs/5878_fix.md
@@ -0,0 +1,2 @@
+ - Fix invalid call to `lib.promiseError` in lib.syncOrAsync  [[#5878](https://github.com/plotly/plotly.js/pull/5878)], 
+   with thanks to @jklimke for the contribution!
diff --git a/src/lib/index.js b/src/lib/index.js
index d838ddfc948..5d97f2cfc89 100644
--- a/src/lib/index.js
+++ b/src/lib/index.js
@@ -455,8 +455,7 @@ lib.syncOrAsync = function(sequence, arg, finalStep) {
         ret = fni(arg);
 
         if(ret && ret.then) {
-            return ret.then(continueAsync)
-                .then(undefined, lib.promiseError);
+            return ret.then(continueAsync);
         }
     }