diff --git a/src/plugins/plugin.ts b/src/plugins/plugin.ts
index a1b2cbc1a..1be9f8508 100644
--- a/src/plugins/plugin.ts
+++ b/src/plugins/plugin.ts
@@ -51,7 +51,13 @@ function setIndex(args: any[], opts: any = {}, resolve?: Function, reject?: Func
   } else if (typeof opts.successIndex !== 'undefined' || typeof opts.errorIndex !== 'undefined') {
     // If we've specified a success/error index
     args.splice(opts.successIndex, 0, resolve);
-    args.splice(opts.errorIndex, 0, reject);
+
+    // We don't want that the reject cb gets spliced into the position of an optional argument that has not been defined and thus causing non expected behaviour.
+    if (opts.errorIndex > args.length) {
+      args[opts.errorIndex] = reject; //insert the reject fn at the correct specific index
+    } else {
+      args.splice(opts.errorIndex, 0, reject); //otherwise just splice it into the array
+    }
   } else {
     // Otherwise, let's tack them on to the end of the argument list
     // which is 90% of cases