After updating Jenkins and its plugins to the current versions, choosing "Save" in a project configuration fails with the attached StackTrace.

The main reason seems that the URL for the gitweb browser is not accepted anymore. If you just look at the last 30 lines of the stack trace:

Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.git.browser.GitRepositoryBrowser from

at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:589)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:684)
... 100 more
Caused by: java.lang.IllegalArgumentException: java.net.MalformedURLException
at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:462)
at org.kohsuke.stapler.RequestImpl.bindParameters(RequestImpl.java:392)
at org.kohsuke.stapler.RequestImpl.bindParameters(RequestImpl.java:363)
at hudson.plugins.git.browser.GitWeb$GitWebDescriptor.newInstance(GitWeb.java:88)
at hudson.plugins.git.browser.GitWeb$GitWebDescriptor.newInstance(GitWeb.java:80)
at hudson.model.Descriptor$1.instantiate(Descriptor.java:1046)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:665)
at org.kohsuke.stapler.RequestImpl.access$100(RequestImpl.java:81)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:587)
... 102 more
Caused by: java.net.MalformedURLException
at java.net.URL.<init>(URL.java:619)
at java.net.URL.<init>(URL.java:482)
at java.net.URL.<init>(URL.java:431)
at hudson.plugins.git.browser.GitWeb.<init>(GitWeb.java:28)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:447)
... 110 more
Caused by: java.lang.NullPointerException

It worked before and if I understand the gitweb stuff correctly, there is no other way to address a repository.

Please have a look and advice.
Thank you very much!
– Matthias