Problem: IllegalStateException after update

I am working on a Vaadin application bootstrapped with springBoot. When I tried to build the application this morning (without performing any changes since the last successful build), i got the following stacktrace:

Using Gradle Vaadin Plugin 0.10.5
:compileJava UP-TO-DATE
:vaadinUpdateWidgetset FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':vaadinUpdateWidgetset'.
> String index out of range: 1

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':vaadinUpdateWidgetset'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
...
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 1
at java_lang_String$replaceAll$2.call(Unknown Source)
at fi.jasoft.plugin.tasks.UpdateWidgetsetTask.ensureWidgetPresent(UpdateWidgetsetTask.groovy:60)
at fi.jasoft.plugin.tasks.UpdateWidgetsetTask.ensureWidgetPresent(UpdateWidgetsetTask.groovy)
at fi.jasoft.plugin.tasks.UpdateWidgetsetTask$ensureWidgetPresent.callStatic(Unknown Source)
at fi.jasoft.plugin.tasks.UpdateWidgetsetTask.run(UpdateWidgetsetTask.groovy:46)
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)

BUILD FAILED

Total time: 9.743 secs
Exception in thread "Thread-3" java.lang.IllegalStateException: Shutdown in progress
at java.lang.ApplicationShutdownHooks.remove(ApplicationShutdownHooks.java:82)
at java.lang.Runtime.removeShutdownHook(Runtime.java:237)
at java_lang_Runtime$removeShutdownHook$2.call(Unknown Source)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
at fi.jasoft.plugin.tasks.SuperDevModeTask$_closure1.doCall(SuperDevModeTask.groovy:44)
at fi.jasoft.plugin.tasks.SuperDevModeTask$_closure1.doCall(SuperDevModeTask.groovy)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1019)
at groovy.lang.Closure.call(Closure.java:426)
at groovy.lang.Closure.call(Closure.java:420)
at groovy.lang.Closure.run(Closure.java:507)
at java.lang.Thread.run(Thread.java:722)

 The first time i ran the build gradle pulled some updates, but that's the only difference to the previous build I've been able to spot.
What could be the cause of this behaviour? I already tried to delete the build and widgetset folders, same result. Could this be an issue related to a recent dependency update? Thanks in advance!