diff -ru harfbuzz-2.1.3.orig/src/hb-aat-layout-kerx-table.hh harfbuzz-2.1.3/src/hb-aat-layout-kerx-table.hh
--- harfbuzz-2.1.3.orig/src/hb-aat-layout-kerx-table.hh	2018-11-17 01:10:09.000000000 +0100
+++ harfbuzz-2.1.3/src/hb-aat-layout-kerx-table.hh	2022-02-01 13:19:10.829775494 +0100
@@ -897,7 +897,7 @@
       reverse = bool (st->u.header.coverage & st->u.header.Backwards) !=
 		HB_DIRECTION_IS_BACKWARD (c->buffer->props.direction);
 
-      if (!c->buffer->message (c->font, "start %c%c%c%c subtable %d", HB_UNTAG (thiz()->tableTag), c->lookup_index))
+      if (!c->buffer->message (c->font, "start %c%c%c%c subtable %d", HB_UNTAG (T::tableTag), c->lookup_index))
 	goto skip;
 
       if (!seenCrossStream &&
@@ -927,7 +927,7 @@
       if (reverse)
 	c->buffer->reverse ();
 
-      (void) c->buffer->message (c->font, "end %c%c%c%c subtable %d", HB_UNTAG (thiz()->tableTag), c->lookup_index);
+      (void) c->buffer->message (c->font, "end %c%c%c%c subtable %d", HB_UNTAG (T::tableTag), c->lookup_index);
 
     skip:
       st = &StructAfter<SubTable> (*st);