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PiperOrigin-RevId: 938084441

src/hunspell/hunspell.cxx

diff --git a/src/hunspell/hunspell.cxx b/src/hunspell/hunspell.cxx
index 54665ce..2578721 100644
--- a/src/hunspell/hunspell.cxx
+++ b/src/hunspell/hunspell.cxx
@@ -1301,12 +1301,14 @@
       int len;
       w_char u[MAXWORDLEN];
       len = u8_u16(u, MAXWORDLEN, p);
-      unsigned short i = unicodetoupper((u[0].h << 8) + u[0].l, langnum);
-      u[0].h = (unsigned char) (i >> 8);
-      u[0].l = (unsigned char) (i & 0x00FF);
-      // TODO: p might not be long enough if the upper case character
-      // is longer in UTF-8 than the original one.
-      u16_u8(p, strlen(p), u, len);
+      if (len > 0) {
+        unsigned short i = unicodetoupper((u[0].h << 8) + u[0].l, langnum);
+        u[0].h = (unsigned char)(i >> 8);
+        u[0].l = (unsigned char)(i & 0x00FF);
+        // TODO: p might not be long enough if the upper case
+        // character is longer in UTF-8 than the original one.
+        u16_u8(p, strlen(p), u, len);
+      }
   }
 }