fixed checking valid range for drawing wrapped text

diff --git a/src/libgame/text.c b/src/libgame/text.c
index 0f1c05f9157a605f55b140af27c112fbc526457e..d946f7721d2433f26d7f553bc3de59e5f2591edd 100644 (file)
--- a/src/libgame/text.c
+++ b/src/libgame/text.c
@@ -765,7 +765,7 @@ int DrawWrappedText(int x, int y, struct WrappedTextInfo *wrapped_text, int star
   if (wrapped_text == NULL)
     return 0;
 
-  if (start_pos >= wrapped_text->num_lines)
+  if (start_pos < 0 || start_pos >= wrapped_text->num_lines)
     return 0;
 
   wrapped_text->line_visible_first = start_pos;