Xray Migration Tool fails with NPE while importing Test Steps

The main reason for failing is due changes in the Jira-Target

Imagine a scenario where, in the Jira-Origin, there is an Manual Test Issue called A-1 with the following steps:

Then a backup file is generated, it will contain the info regarding the issue A-1, including its Steps.

After this, the project A is imported into the Jira-Target. Everything should be imported with success.

Then some time passes by, let's say a week. There could've been lots of activities under the issue A-1 in the Jira-Target. Let's imagine that during this time the step 'Step2' was removed.

Then the project B is imported, the process will fail with the following error:

unexpected error occurred while importing the project with key: XP
java.lang.NullPointerException
    at com.xpandit.raven.imports.project.ao.TestStepImport.handleEntity(TestStepImport.java:103)

This happens due to the fact that the Step2 was removed from the issue A-1 in the Jira-Target but the backup file says A-1 has a Step2.

Note: May also happen when changing the issue type