Rerunning a Bamboo build fails if the plans has "bamboo.planRepository.<position>.previousRevision" system variable

Issue Summary

If a plan in Bamboo is having "bamboo.planRepository.<position>.previousRevision" system variable and if you try to rerun a build, it will fail with an error

This is reproducible on Data Center: (yes)

Steps to Reproduce

1. Define a plan in Bamboo with a simple script task and link any repository to this plan
2. In the script task try to print the value of the variable using the below command

   echo ${bamboo.planRepository.previousRevision}
   

3. Run the build for the first time, it will complete successfully
4. Rerun the same build

Expected Results

• The build should complete successfully

Actual Results

• The build fails with the below exception

  /var/atlassian/application-data/bamboo/temp/SCRIP-TIC-JOB1-228-ScriptBuildTask-9328576534053004432.sh: 1: Bad substitution
  Failing task since return code of [/var/atlassian/application-data/bamboo/temp/SCRIP-TIC-JOB1-228-ScriptBuildTask-9328576534053004432.sh] was 2 while expected 0
  

Workaround

Workaround is to run a fresh build and the plan will successfully complete.