CSP source *.x.y should not match host x.y

Source/core/frame/csp/ContentSecurityPolicy.cpp

Index: Source/core/frame/csp/ContentSecurityPolicy.cpp
diff --git a/Source/core/frame/csp/ContentSecurityPolicy.cpp b/Source/core/frame/csp/ContentSecurityPolicy.cpp
index 601b66535037f5f7b3d77c60a933c98215561240..85167e069743e3d1d0fe1ca0b050c28fad75867a 100644
--- a/Source/core/frame/csp/ContentSecurityPolicy.cpp
+++ b/Source/core/frame/csp/ContentSecurityPolicy.cpp
@@ -223,7 +223,7 @@ DEFINE_TRACE(ContentSecurityPolicy)
 
 Document* ContentSecurityPolicy::document() const
 {
-    return m_executionContext->isDocument() ? toDocument(m_executionContext) : nullptr;
+    return (m_executionContext && m_executionContext->isDocument()) ? toDocument(m_executionContext) : nullptr;
 }
 
 void ContentSecurityPolicy::copyStateFrom(const ContentSecurityPolicy* other)