Index: Modules/_struct.c
===================================================================
--- Modules/_struct.c	(révision 66627)
+++ Modules/_struct.c	(copie de travail)
@@ -1786,6 +1786,8 @@
 
 	/* Extract the offset from the first argument */
 	offset = PyLong_AsSsize_t(PyTuple_GET_ITEM(args, 1));
+	if (offset == -1 && PyErr_Occurred())
+		return NULL;
 
 	/* Support negative offsets. */
 	if (offset < 0)