Failed to assembly when converted to code in IDA

[confile]

I use IDAP Pro 7.1 wich keypatcher 2.2. At address 0048ED60 I want to insert some code:

I inserted push esp:

After hitting the patch button I get this:

That is correct. IDA tries to interpret the code. When I now try to continue editing lie in this screenshot:

and hit the Patch button, then I get the following error.

In order to make the plugin work I need to cancel editing after the first operation. Go to the edited address 0048ED60 and hit u für undefine. After that I can continue with the keypatcher.

Can you please fix that? It makes multi editing very hard.