--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -5882,18 +5882,21 @@ nsCSSFrameConstructor::AddFrameConstruct
           ServoRestyleManager::ClearServoDataFromSubtree(element);
           styleSet->StyleNewSubtree(element);
 
           // Servo's should_traverse_children() in traversal.rs skips
           // styling descendants of elements with a -moz-binding the
           // first time. Thus call StyleNewChildren() again.
           styleSet->StyleNewChildren(element);
 
+          auto parent = styleContext->GetParentAllowServo();
+          ServoStyleContext* parentServo =  parent ? parent->AsServo() : nullptr;
+
           styleContext =
-            styleSet->ResolveStyleFor(element, styleContext->GetParentAllowServo()->AsServo(),
+            styleSet->ResolveStyleFor(element, parent,
                                       LazyComputeBehavior::Assert);
         } else {
           styleContext =
             ResolveStyleContext(styleContext->GetParent(), aContent, &aState);
         }
 
         display = styleContext->StyleDisplay();
         aStyleContext = styleContext;