See here: Based on the GIT site, https://github.com/jenkinsci/svnkit, I believe the 1.7.6 version of svnkit has been merged in October (and 1.7.5-v1 in July).
In my Jenkins plugin Manager I only see Subversion Plugin 1.45 offered.
Subversion SCM$Check Out Task.invoke(Subversion SCM.java:753) at hudson. SCMCheckout Strategy.checkout(SCMCheckout Strategy.java:88) at hudson.model. Abstract Build$Abstract Build Execution.run(Abstract Build.java:494) at hudson.model. Free Style Build.run(Free Style Build.java:46) at hudson.model.
Resource Controller.execute(Resource Controller.java:88) at hudson.model. Executor.run(Executor.java:239) I clicked the "Downgrade to 1.39" button in the installed plugins section, restarted Jenkins and the problem appears to be solved.
In searching this issue, I noticed a similar issue on the Jet Brains site which they say is fixed with svnkit 1.7.5-v1.
(I am at 1.44.) Based on https://wiki.jenkins-ci.org/display/JENKINS/Subversion+Plugin, it looks like 1.45 includes SVNKit 1.7.6 since January.