Index: source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
===================================================================
--- source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
+++ source/Plugins/ExpressionParser/Clang/ClangExpressionDeclMap.cpp
@@ -1430,7 +1430,14 @@
                                                                   &fdi.m_name,
                                                                   &fdi.m_copied_type);
                         }
-                        fdi_cache.emplace_back(fdi);
+                        if (fdi.m_decl_lvl == LLDB_INVALID_DECL_LEVEL)
+                        {
+                            if (log)
+                                log->Printf("INVALID_DECL_LEVEL for function declaration '%s'",
+                                            fdi.m_name.GetCString());
+                        }
+                        else
+                            fdi_cache.emplace_back(fdi);
                     }
 
                     // Loop through the functions in our cache looking for matching types,