Branch pipeline halts on multiple merged PRs “Another pipeline is deploying to Staging”

[MavenSphere Dev]

I am facing an issue with my Bitbucket pipelines where branch deployments halt when multiple PRs are merged

Here is pipeline URL - https://bitbucket.org/MavenSphere/backend-apis/pipelines/results/1168/steps/%7B97c9da85-c989-49a1-8a2d-f2033fe299af%7D

There are others too, those are halt and doesn't rerun again, every time it shows same error, so need help figure it out