diff --git a/myisam/sort.c b/myisam/sort.c
index 7c6efa9a05b..0bbf7efa659 100644
--- a/myisam/sort.c
+++ b/myisam/sort.c
@@ -587,13 +587,15 @@ int thr_write_keys(MI_SORT_PARAM *sort_param)
 
       while (!got_error &&
 	     !my_b_read(&sinfo->tempfile_for_exceptions,(byte*)&key_length,
-			sizeof(key_length)) &&
-	     !my_b_read(&sinfo->tempfile_for_exceptions,(byte*)mergebuf,
-			(uint) key_length))
+			sizeof(key_length)))
       {
-	if (_mi_ck_write(info,sinfo->key,(uchar*) mergebuf,
-			 key_length - info->s->rec_reflength))
-	  got_error=1;
+        byte ft_buf[HA_FT_MAXLEN + HA_FT_WLEN + 10];
+        if (key_length > sizeof(ft_buf) ||
+            my_b_read(&sinfo->tempfile_for_exceptions, (byte*)ft_buf,
+                      (uint)key_length) ||
+            _mi_ck_write(info, sinfo->key, (uchar*)ft_buf,
+                         key_length - info->s->rec_reflength))
+          got_error=1;
       }
     }
   }
diff --git a/mysql-test/r/fulltext.result b/mysql-test/r/fulltext.result
index 7ac7e1ca72b..8fa2df2e756 100644
--- a/mysql-test/r/fulltext.result
+++ b/mysql-test/r/fulltext.result
@@ -421,3 +421,11 @@ SELECT COUNT(*) FROM t1 WHERE MATCH(t) AGAINST ('"osnabr
 COUNT(*)
 1
 DROP TABLE t1;
+CREATE TABLE t1 (a VARCHAR(30), FULLTEXT(a));
+INSERT INTO t1 VALUES('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
+SET myisam_repair_threads=2;
+REPAIR TABLE t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	status	OK
+SET myisam_repair_threads=@@global.myisam_repair_threads;
+DROP TABLE t1;
diff --git a/mysql-test/t/fulltext.test b/mysql-test/t/fulltext.test
index 6212ea6e8bb..fa63778c4c1 100644
--- a/mysql-test/t/fulltext.test
+++ b/mysql-test/t/fulltext.test
@@ -339,4 +339,15 @@ INSERT INTO t1 VALUES('Mit freundlichem Gr
 SELECT COUNT(*) FROM t1 WHERE MATCH(t) AGAINST ('"osnabrück"' IN BOOLEAN MODE);
 DROP TABLE t1;
 
+#
+# BUG#11684 - repair crashes mysql when table has fulltext index
+#
+
+CREATE TABLE t1 (a VARCHAR(30), FULLTEXT(a));
+INSERT INTO t1 VALUES('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb');
+SET myisam_repair_threads=2;
+REPAIR TABLE t1;
+SET myisam_repair_threads=@@global.myisam_repair_threads;
+DROP TABLE t1;
+
 # End of 4.1 tests