No matter if stash succed or not unstash always pass.

I want to stash file but I dont know if it exists. If file exists everything goes well my_jar is saved and I can unstash it. But... if file doesnt exists it goes to catch() section and I guess that unstash also should go to catch() section but it's not happening. Instead of it  unstash return success (without any files). It means that during stash section "my_jar" label is created and unstash recognize it as stashed file.

(NODE1){
    try {
        stash includes: 'some_jar.jar', name: 'my_jar'
    }
    catch(e){
       println(e.toString())
    }
}
.
.
.
(NODE2){
     try {
        unstash 'my_jar'
     } 
    catch (e) {
        println(e.toString())
        //DO SOMETING
}