EDIT

E.g. for GatheringEvent

login : admin
editor version : 4.5.1
server : api.cybertaxonomy.org (cybertaxonomy.org) / caryo_nepenthaceae
schema version : 4.1.0.0.201607300000
os : Windows Server 2012 R2 6.3 amd64
java : 1.8.0_121
java.lang.NullPointerException
    at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1838)
    at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
    at java.lang.Double.parseDouble(Double.java:538)
    at java.lang.Double.<init>(Double.java:608)
    at eu.etaxonomy.taxeditor.ui.element.NumberWithLabelElement.getDouble(NumberWithLabelElement.java:95)
    at eu.etaxonomy.taxeditor.ui.element.MinMaxTextSection.updateMaximum(MinMaxTextSection.java:234)
    at eu.etaxonomy.taxeditor.ui.element.MinMaxTextSection.handleEvent(MinMaxTextSection.java:165)
    at eu.etaxonomy.taxeditor.ui.element.MinMaxTextSection.propertyChange(MinMaxTextSection.java:149)
    at eu.etaxonomy.taxeditor.ui.element.AbstractCdmFormElement.firePropertyChangeEvent(AbstractCdmFormElement.java:235)
    at eu.etaxonomy.taxeditor.ui.element.TextWithLabelElement.modifyText(TextWithLabelElement.java:186)
    at eu.etaxonomy.taxeditor.ui.element.NumberWithLabelElement.modifyText(NumberWithLabelElement.java:118)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:179)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1058)
    at org.eclipse.swt.widgets.Text.wmCommandChild(Text.java:2610)
    at org.eclipse.swt.widgets.Control.WM_COMMAND(Control.java:4669)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4531)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4985)
    at org.eclipse.swt.internal.win32.OS.CallWindowProcW(Native Method)
    at org.eclipse.swt.internal.win32.OS.CallWindowProc(OS.java:2425)
    at org.eclipse.swt.widgets.Text.callWindowProc(Text.java:255)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4623)
    at org.eclipse.swt.widgets.Text.windowProc(Text.java:2254)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4985)
    at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
    at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2531)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3752)
    at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
    at org.eclipse.jface.window.Window.open(Window.java:801)
    at eu.etaxonomy.taxeditor.ui.selection.EntitySelectionElement$EditListener.widgetSelected(EntitySelectionElement.java:410)
    at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
    at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at eu.etaxonomy.taxeditor.Application.start(Application.java:24)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)