diff --git a/vcl/source/gdi/pdfwriter_impl.cxx b/vcl/source/gdi/pdfwriter_impl.cxx
index 70ccd94..c48ee02 100644
--- a/vcl/source/gdi/pdfwriter_impl.cxx
+++ b/vcl/source/gdi/pdfwriter_impl.cxx
@@ -7772,14 +7772,17 @@ void PDFWriterImpl::drawLayout( SalLayout& rLayout, const String& rText, bool bT
                 aUnicodes.push_back( rText.GetChar( sal::static_int_cast<xub_StrLen>(pCharPosAry[i]) ) );
                 pUnicodesPerGlyph[i] = 1;
                 // try to handle ligatures and such
-                if( i < nGlyphs-1 )
+                if( i < nGlyphs )
                 {
-                    nChars = pCharPosAry[i+1] - pCharPosAry[i];
+                    if( i < nGlyphs-1 )
+                        nChars = pCharPosAry[i+1] - pCharPosAry[i];
+                    else
+                        nChars = rText.Len() - pCharPosAry[i];
                     // #i115618# fix for simple RTL+CTL cases
                     // TODO: sanitize for RTL ligatures, more complex CTL, etc.
                     if( nChars < 0 )
                         nChars = -nChars;
-            else if( nChars == 0 )
+                    else if( nChars == 0 )
                         nChars = 1;
                     pUnicodesPerGlyph[i] = nChars;
                     for( int n = 1; n < nChars; n++ )