diff --git a/docshell/base/BrowsingContext.cpp b/docshell/base/BrowsingContext.cpp
index bb43ea4d6e2a..dbec320a7f9f 100644
--- a/docshell/base/BrowsingContext.cpp
+++ b/docshell/base/BrowsingContext.cpp
@@ -283,7 +283,7 @@ void BrowsingContext::Detach(bool aFromIPC) {
 
   RefPtr<BrowsingContext> kungFuDeathGrip(this);
 
-  if (!Group()->EvictCachedContext(this)) {
+  if (Group() && !Group()->EvictCachedContext(this)) {
     Children* children = nullptr;
     if (mParent) {
       children = &mParent->mChildren;