prevent accessing empty vector

Fixes https://github.com/root-project/root/issues/10180
2022-03-21 11:32:51 +01:00 · 2022-03-21 11:32:51 +01:00 · 97166bc3b2
commit 97166bc3b2
parent a575990cfc
1 changed files with 1 additions and 0 deletions
--- a/lib/UserInterface/textinput/Editor.cpp
+++ b/lib/UserInterface/textinput/Editor.cpp
@ -384,6 +384,7 @@ namespace textinput {
        return kPRSuccess;
      }
      case kCmdUndo:
+        if (fUndoBuf.empty()) return kPRSuccess;
        Line = fUndoBuf.back().first;
        fContext->SetCursor(fUndoBuf.back().second);
        fUndoBuf.pop_back();