maven-release-plugin with github project

I'm trying to release a multimodule maven project cloned in github. My project has the parent pom as a submodule of the root aggregator. if i run the release in dryRun mode it works fine, however if I run it for real this is what i get near the end

...
[INFO] Checking in modified POMs...
[INFO] Executing: /bin/sh -c cd "/home/hilikus/dev/Eclipse workspace/JRoboCom" && git add -- jrobocom-parent/pom.xml jrobocom-core/pom.xml jrobocom-simple-gui/pom.xml jrobocom-samples/pom.xml jrobocom-samples/legends/pom.xml jrobocom-samples/simple/pom.xml jrobocom-samples/simple/4Lunch/pom.xml jrobocom-samples/simple/black-jacks/pom.xml jrobocom-samples/simple/bank-jumper/pom.xml pom.xml
[INFO] Working directory: /home/hilikus/dev/Eclipse workspace/JRoboCom
[INFO] Executing: /bin/sh -c cd "/home/hilikus/dev/Eclipse workspace/JRoboCom" && git status
[INFO] Working directory: /home/hilikus/dev/Eclipse workspace/JRoboCom
[INFO] Executing: /bin/sh -c cd "/home/hilikus/dev/Eclipse workspace/JRoboCom" && git commit --verbose -F /tmp/maven-scm-646807004.commit jrobocom-parent/pom.xml jrobocom-core/pom.xml jrobocom-simple-gui/pom.xml jrobocom-samples/pom.xml jrobocom-samples/legends/pom.xml jrobocom-samples/simple/pom.xml jrobocom-samples/simple/4Lunch/pom.xml jrobocom-samples/simple/black-jacks/pom.xml jrobocom-samples/simple/bank-jumper/pom.xml pom.xml
[INFO] Working directory: /home/hilikus/dev/Eclipse workspace/JRoboCom
[INFO] Executing: /bin/sh -c cd "/home/hilikus/dev/Eclipse workspace/JRoboCom" && git symbolic-ref HEAD
[INFO] Working directory: /home/hilikus/dev/Eclipse workspace/JRoboCom
[INFO] Executing: /bin/sh -c cd "/home/hilikus/dev/Eclipse workspace/JRoboCom" && git push https://github.com/theHilikus/JRoboCom.git/jrobocom-aggregator master:master
[INFO] Working directory: /home/hilikus/dev/Eclipse workspace/JRoboCom
[INFO]