diff --git a/src/plugins/cppeditor/cppeditordocument.cpp b/src/plugins/cppeditor/cppeditordocument.cpp
index 3d33e1f3f9c..77bffc7338c 100644
--- a/src/plugins/cppeditor/cppeditordocument.cpp
+++ b/src/plugins/cppeditor/cppeditordocument.cpp
@@ -169,7 +169,8 @@ void CppEditorDocument::applyFontSettings()
         }
     }
     TextDocument::applyFontSettings(); // rehighlights and updates additional formats
-    m_processor->semanticRehighlight();
+    if (m_processor)
+        m_processor->semanticRehighlight();
 }
 
 void CppEditorDocument::invalidateFormatterCache()