--- a/layout/style/ServoStyleSet.cpp
+++ b/layout/style/ServoStyleSet.cpp
@@ -362,26 +362,28 @@ ServoStyleSet::ProbePseudoElementStyle(E
   }
   return ProbePseudoElementStyle(aParentElement, aType, aParentContext);
 }
 
 nsRestyleHint
 ServoStyleSet::HasStateDependentStyle(dom::Element* aElement,
                                       EventStates aStateMask)
 {
-  MOZ_CRASH("stylo: not implemented");
+  NS_ERROR("stylo: HasStateDependentStyle not implemented");
+  return nsRestyleHint(0);
 }
 
 nsRestyleHint
 ServoStyleSet::HasStateDependentStyle(dom::Element* aElement,
                                       CSSPseudoElementType aPseudoType,
                                      dom::Element* aPseudoElement,
                                      EventStates aStateMask)
 {
-  MOZ_CRASH("stylo: not implemented");
+  NS_ERROR("stylo: HasStateDependentStyle not implemented");
+  return nsRestyleHint(0);
 }
 
 void
 ServoStyleSet::RestyleSubtree(nsINode* aNode, bool aForce)
 {
   if (aForce) {
     MOZ_ASSERT(aNode->IsContent());
     ServoRestyleManager::DirtyTree(aNode->AsContent());