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-rw-r--r--generic/tclVar.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/generic/tclVar.c b/generic/tclVar.c
index e897790..fa217ef 100644
--- a/generic/tclVar.c
+++ b/generic/tclVar.c
@@ -600,7 +600,7 @@ TclObjLookupVarEx(
}
part1 = TclGetStringFromObj(part1Ptr, &len1);
- if (!parsed && (*(part1 + len1 - 1) == ')')) {
+ if (!parsed && len1 && (*(part1 + len1 - 1) == ')')) {
/*
* part1Ptr is possibly an unparsed array element.
*/