diff --git a/NEWS.md b/NEWS.md
index da86628b..2b9ff2fe 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,5 @@
 Version 0.8.6 For Dev-C++ 7 Beta
- - enhancement: greatly reduces memory usage for symbol parsing ( memory needed for bits/stdc++.h reduced from 150m+ to 50m+)
+ - enhancement: greatly reduces memory usage for symbol parsing ( memory needed for bits/stdc++.h reduced from 150m+ to 80m+)
  - fix: currect compiler set not correctly updated when switch between normal file and project file
 
 Version 0.8.5 For Dev-C++ 7 Beta
diff --git a/RedPandaIDE/widgets/codecompletionpopup.cpp b/RedPandaIDE/widgets/codecompletionpopup.cpp
index 9bc19456..78dbc867 100644
--- a/RedPandaIDE/widgets/codecompletionpopup.cpp
+++ b/RedPandaIDE/widgets/codecompletionpopup.cpp
@@ -894,6 +894,7 @@ void CodeCompletionPopup::hideEvent(QHideEvent *event)
     mIncludedFiles.clear();
     mUsings.clear();
     mAddedStatements.clear();
+    mParser = nullptr;
     QWidget::hideEvent(event);
 }
 
diff --git a/RedPandaIDE/widgets/headercompletionpopup.cpp b/RedPandaIDE/widgets/headercompletionpopup.cpp
index 865ea1ad..3ec95200 100644
--- a/RedPandaIDE/widgets/headercompletionpopup.cpp
+++ b/RedPandaIDE/widgets/headercompletionpopup.cpp
@@ -227,6 +227,7 @@ void HeaderCompletionPopup::hideEvent(QHideEvent *)
 {
     mCompletionList.clear();
     mFullCompletionList.clear();
+    mParser = nullptr;
 }
 
 bool HeaderCompletionPopup::event(QEvent *event)