diff --git "a/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c" "b/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c"
index 8d9737310c7..2d5d0dbb81b 100644
--- "a/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c"
+++ "b/sdk/lib/3rdparty/freetype/src/sfnt/ttcmap.c"
@@ -1242,6 +1242,16 @@
 
     num_segs = num_segs2 >> 1;
 
+    if (charcode == 0xa6a0)
+    {
+      FT_ERROR(( "Debug1:"
+                 "charcode is 0x%x\n", charcode ));
+      FT_ERROR(( "Debug2:"
+                 "num_segs is %d\n", num_segs ));
+      FT_ERROR(( "Debug3:"
+                 "Font is %s\n",  face->name_table.names[1].string ));
+    }
+
     /* make compiler happy */
     mid = num_segs;
     end = 0xFFFFU;
@@ -1267,6 +1277,15 @@
         min = mid + 1;
       else
       {
+
+        if (!(min == 0 && max == 1))
+        {
+          FT_ERROR(( "Debug4:"
+                     "min/max is %d/%d\n", min, max ));
+          FT_ERROR(( "Debug5:"
+                     "charcode is 0x%x\n", charcode ));
+        }
+
         p     += num_segs2;
         delta  = TT_PEEK_SHORT( p );
         p     += num_segs2;
@@ -1404,7 +1423,12 @@
           if ( next && p > limit )
             break;
 
-          gindex = TT_PEEK_USHORT( p );
+          FT_ERROR(( "Debug6:"
+                     "charcode is 0x%x\n", charcode ));
+          FT_ERROR(( "Debug7:"
+                     "Font is %s\n",  face->name_table.names[1].string ));
+
+          gindex = TT_PEEK_USHORT( p ); // CORE-12549
           if ( gindex )
           {
             gindex = (FT_UInt)( (FT_Int)gindex + delta ) & 0xFFFFU;