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-rw-r--r--generic/tclEvent.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/generic/tclEvent.c b/generic/tclEvent.c
index eb136af..1663b82 100644
--- a/generic/tclEvent.c
+++ b/generic/tclEvent.c
@@ -232,7 +232,11 @@ HandleBgErrors(
* support one handler setting another handler.
*/
- Tcl_Obj *copyObj = TclDuplicatePureObj(assocPtr->cmdPrefix);
+ Tcl_Obj *copyObj = TclDuplicatePureObj(
+ interp, assocPtr->cmdPrefix, &tclListType);
+ if (!copyObj) {
+ return;
+ }
errPtr = assocPtr->firstBgPtr;