diff options
Diffstat (limited to 'generic/tclVar.c')
| -rw-r--r-- | generic/tclVar.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/generic/tclVar.c b/generic/tclVar.c index 9815469..a1885b5 100644 --- a/generic/tclVar.c +++ b/generic/tclVar.c @@ -2554,13 +2554,14 @@ Tcl_AppendObjCmd( /* * Note that we do not need to increase the refCount of the Var * pointers: should a trace delete the variable, the return value - * of TclPtrSetVar will be NULL, and we will not access the - * variable again. + * of TclPtrSetVar will be NULL or emptyObjPtr, and we will not + * access the variable again. */ varValuePtr = TclPtrSetVar(interp, varPtr, arrayPtr, objv[1], NULL, objv[i], TCL_APPEND_VALUE|TCL_LEAVE_ERR_MSG, -1); - if (varValuePtr == NULL) { + if ((varValuePtr == NULL) || + (varValuePtr == ((Interp *) interp)->emptyObjPtr)) { return TCL_ERROR; } } |