Patch is here:
diff --git a/src/interp/i-syscmd.boot b/src/interp/i-syscmd.boot
index a9a1e4a..38027a5 100644
--- a/src/interp/i-syscmd.boot
+++ b/src/interp/i-syscmd.boot
@@ -304,7 +304,7 @@ clearCmdAll() ==
if $useInternalHistoryTable
then $internalHistoryTable := NIL
else deleteFile histFileName()
- $IOindex := 1
+ if not null $IOindex then $IOindex := 1
updateCurrentInterpreterFrame()
$currentLine := '")clear all" --restored 3/94; needed for undo (RDJ)
clearMacroTable()
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