Hi @Vernalis,
first of, Merry Christmas mate 
I was prepping a workflow encapsuled in a Container In-/Output and got a NullPointerException
Knime Console
ERROR Benchmark Start (Memory Monitoring) 6:1684 failed to apply settings: Cannot invoke "org.knime.core.node.workflow.FlowObjectStack.peek(java.lang.Class)" because the return value of "org.knime.core.node.workflow.NativeNodeContainer.getOutgoingFlowObjectStack()" is null
Knime log
2025-12-24 16:29:26,279 : WARN : main : : ResetAction : : : Reset not allowed
java.lang.NullPointerException: Cannot invoke "org.knime.core.node.workflow.FlowObjectStack.peek(java.lang.Class)" because the return value of "org.knime.core.node.workflow.NativeNodeContainer.getOutgoingFlowObjectStack()" is null
at org.knime.core.node.workflow.WorkflowManager.resetNonSuccessorLoopStart(WorkflowManager.java:5595)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(Unknown Source)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(Unknown Source)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(Unknown Source)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(Unknown Source)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(Unknown Source)
at java.base/java.util.Iterator.forEachRemaining(Unknown Source)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.copyInto(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(Unknown Source)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(Unknown Source)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(Unknown Source)
at java.base/java.util.stream.AbstractPipeline.evaluate(Unknown Source)
at java.base/java.util.stream.ReferencePipeline.forEach(Unknown Source)
at org.knime.core.node.workflow.WorkflowManager.resetAndConfigureAffectedLoopContext(WorkflowManager.java:5585)
at org.knime.core.node.workflow.WorkflowManager.resetAndConfigureAffectedLoopContext(WorkflowManager.java:5550)
at org.knime.core.node.workflow.WorkflowManager.resetNodeAndSuccessors(WorkflowManager.java:5514)
at org.knime.core.node.workflow.WorkflowManager.resetAndConfigureNodeAndSuccessors(WorkflowManager.java:5710)
at org.knime.core.node.workflow.WorkflowManager.resetAndConfigureNode(WorkflowManager.java:5620)
at org.knime.core.ui.wrapper.WorkflowManagerWrapper.resetAndConfigureNode(WorkflowManagerWrapper.java:297)
at org.knime.workbench.editor2.actions.ResetAction.runOnNodes(ResetAction.java:164)
at org.knime.workbench.editor2.actions.AbstractNodeAction.runInSWT(AbstractNodeAction.java:166)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:183)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4803)
at org.knime.workbench.editor2.actions.AbstractNodeAction.run(AbstractNodeAction.java:156)
at org.knime.workbench.editor2.actions.delegates.AbstractEditorAction.run(AbstractEditorAction.java:126)
at org.eclipse.ui.internal.handlers.ActionDelegateHandlerProxy.execute(ActionDelegateHandlerProxy.java:285)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:98)
at jdk.internal.reflect.GeneratedMethodAccessor160.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:298)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:232)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:174)
at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:165)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:485)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:204)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:308)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:569)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:644)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:439)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:96)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1287)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1065)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1090)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1075)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1117)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1113)
at org.eclipse.swt.widgets.Widget.wmKeyDown(Widget.java:1840)
at org.eclipse.swt.widgets.Control.WM_KEYDOWN(Control.java:5153)
at org.eclipse.swt.widgets.Canvas.WM_KEYDOWN(Canvas.java:406)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4776)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:340)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:5039)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(Native Method)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3658)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:152)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:639)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:546)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:173)
at org.knime.product.rcp.KNIMEApplication.start(KNIMEApplication.java:213)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:143)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:109)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:439)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:271)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.base/java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
I did the followign steps:
- Executed the call workflow node to popuilate new variables to the remote workflow
- Opend the remote (hosted locally) workflow
- Reset the workflow
- Then modified the data generator node to use a new varaible
- Execute it and started to modify the Benchmark start to reduce the memory monitoring interval to 100 ms when it got triggered
Intruigingly, I cannot reset any node any longer. Trying to replicate the issue Knime won’t even let me reset the workflow. As follows the thread dump if it is of any help.
251224 Vernalis Benchmark NullPointerException threaddump-1766590651394.tdump.txt (73.2 KB)
Cheers mate 
Mike