Description of problem:
This happen with some regularity, although there's no specific action that I can see that causes it.  Sometimes seems to occur when accessing the Application Launcher in KDE and when the various pop-up windows are generated.  But in any case this seems to happen quite often regardless of any specific action that i take.  

Version-Release number of selected component:
evolution-3.18.5.2-1.fc23

Additional info:
reporter:       libreport-2.6.4
backtrace_rating: 4
cmdline:        /usr/bin/evolution
crash_function: WebCore::HTMLElement::parseAttribute
executable:     /usr/bin/evolution
global_pid:     15293
kernel:         4.4.6-300.fc23.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 WebCore::HTMLElement::parseAttribute at Source/WebCore/html/HTMLElement.cpp:349
 #1 WebCore::Element::attributeChanged at Source/WebCore/dom/Element.cpp:1097
 #2 WebCore::Element::didModifyAttribute at Source/WebCore/dom/Element.cpp:2851
 #3 WebCore::Element::setAttributeInternal at Source/WebCore/dom/Element.cpp:1075
 #4 WebCore::CompositeEditCommand::applyCommandToComposite at Source/WebCore/editing/CompositeEditCommand.cpp:278
 #5 WebCore::CompositeEditCommand::setNodeAttribute at Source/WebCore/editing/CompositeEditCommand.cpp:664
 #6 WebCore::ReplaceSelectionCommand::removeRedundantStylesAndKeepStyleSpanInline at Source/WebCore/editing/ReplaceSelectionCommand.cpp:525
 #7 WebCore::ReplaceSelectionCommand::doApply at Source/WebCore/editing/ReplaceSelectionCommand.cpp:1151
 #8 WebCore::CompositeEditCommand::apply at Source/WebCore/editing/CompositeEditCommand.cpp:227
 #9 WebCore::applyCommand at Source/WebCore/editing/CompositeEditCommand.cpp:182