diff --git a/3rdparty/fonts/fnt.cxx b/3rdparty/fonts/fnt.cxx
index e81ad84..560b68d 100644
--- a/3rdparty/fonts/fnt.cxx
+++ b/3rdparty/fonts/fnt.cxx
@@ -233,9 +233,12 @@ void fntTexFont::getBBox ( const char *s,
       }
     }
 
-    if ( ! exists [ cc ] )
+    if ( ! exists [ cc ] ) {
+      SG_LOG(SG_GUI,SG_ALERT, "未找到字符");
       continue ;
 
+    }
+
     if ( italic >= 0 )
     {
       if ( l >       h_pos + v_left [cc]        ) l =       h_pos + v_left [cc]          ;