Checkout fails with Multiple SCMs plugin on commit notification

commit notification 108127644b30e28d326702752aa1150e05227156
[EnvInject] - Loading node environment variables.
[EnvInject] - Preparing an environment for the build.
[EnvInject] - Keeping Jenkins system variables.
[EnvInject] - Keeping Jenkins build variables.
[EnvInject] - Injecting as environment variables the properties content 
[EnvInject] - Variables injected successfully.
[EnvInject] - Injecting contributions.
Building on master in workspace /home/jenkins/workspace/TestNotification
 > /usr/local/bin/git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > /usr/local/bin/git config remote.origin.url ssh://git@git.mydomain.com:7999/project/repo1.git # timeout=10
Fetching upstream changes from ssh://git@git.mydomain.com:7999/project/repo1.git
 > /usr/local/bin/git --version # timeout=10
 > /usr/local/bin/git -c core.askpass=true fetch --tags --progress ssh://git@git.mydomain.com:7999/project/repo1.git +refs/heads/*:refs/remotes/origin/*
 > /usr/local/bin/git rev-parse 108127644b30e28d326702752aa1150e05227156^{commit} # timeout=10
FATAL: Command "/usr/local/bin/git rev-parse 108127644b30e28d326702752aa1150e05227156^{commit}" returned status code 128:
stdout: 108127644b30e28d326702752aa1150e05227156^{commit}

stderr: fatal: ambiguous argument '108127644b30e28d326702752aa1150e05227156^{commit}': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

hudson.plugins.git.GitException: Command "/usr/local/bin/git rev-parse 108127644b30e28d326702752aa1150e05227156^{commit}" returned status code 128:
stdout: 108127644b30e28d326702752aa1150e05227156^{commit}

stderr: fatal: ambiguous argument '108127644b30e28d326702752aa1150e05227156^{commit}': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] -- [<file>...]'

	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1457)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1433)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommandIn(CliGitAPIImpl.java:1429)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommand(CliGitAPIImpl.java:1117)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.launchCommand(CliGitAPIImpl.java:1127)
	at org.jenkinsci.plugins.gitclient.CliGitAPIImpl.revParse(CliGitAPIImpl.java:523)
	at hudson.plugins.git.GitAPI.revParse(GitAPI.java:258)
	at hudson.plugins.git.RevisionParameterAction.toRevision(RevisionParameterAction.java:85)
	at hudson.plugins.git.GitSCM.determineRevisionToBuild(GitSCM.java:872)
	at hudson.plugins.git.GitSCM.checkout(GitSCM.java:985)
	at hudson.scm.SCM.checkout(SCM.java:488)
	at org.jenkinsci.plugins.multiplescms.MultiSCM.checkout(MultiSCM.java:118)
	at hudson.model.AbstractProject.checkout(AbstractProject.java:1252)
	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:624)
	at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:530)
	at hudson.model.Run.execute(Run.java:1732)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:88)
	at hudson.model.Executor.run(Executor.java:234)