jgitflow-maven-plugin always produces merge conflict

Question

I have two branches: master and develop. At the starting point the develop branched from master

Now I try to make two releases in row:

1. First time I did "mvn jgitflow:release-start", "mvn jgitflow:release-finish". It has successfully create a release tag and causes no problem
2. Second time I did the same ("mvn jgitflow:release-start", "mvn jgitflow:release-finish"). This time I get a merge conflict error in my .pom files
3. Third time I made a merge commit from develop to master. After that I did "mvn jgitflow:release-start", "mvn jgitflow:release-finish". This time it has successfully done.

The problem is (2). I always get merge conflict error here if not doing (3)

Is there any way how to avoid manual merges (3) between master and develop branches to make a release with jgitflow-maven-plugin?

<plugin>
    <groupId>external.atlassian.jgitflow</groupId>
    <artifactId>jgitflow-maven-plugin</artifactId>
    <version>1.0-m5.1</version>
    <configuration>
      <flowInitContext>
        <masterBranchName>master</masterBranchName>
        <developBranchName>development</developBranchName>
        <featureBranchPrefix>feature-</featureBranchPrefix>
        <releaseBranchPrefix>release-</releaseBranchPrefix>
        <hotfixBranchPrefix>hotfix-</hotfixBranchPrefix>
        <versionTagPrefix>version-</versionTagPrefix>
      </flowInitContext>
      <noDeploy>true</noDeploy>
      <squash>true</squash>
      <scmCommentPrefix>[RELEASE] </scmCommentPrefix>
    </configuration>
  </plugin>