1 files changed, 5 insertions, 0 deletions
diff --git a/Source/cm_utf8.c b/Source/cm_utf8.c
index 52af4a6..2459c02 100644
--- a/Source/cm_utf8.c
+++ b/Source/cm_utf8.c
@@ -71,6 +71,11 @@ const char* cm_utf8_decode_character(const char* first, const char* last,
       return 0;
     }
 
+    /* UTF-16 surrogate halves. */
+    if (0xD800 <= uc && uc <= 0xDFFF) {
+      return 0;
+    }
+
     *pc = uc;
     return first;
   }