diff --git a/mysql-test/r/ctype_ldml.result b/mysql-test/r/ctype_ldml.result
index fe870f82743..d5585dcfad9 100644
--- a/mysql-test/r/ctype_ldml.result
+++ b/mysql-test/r/ctype_ldml.result
@@ -41,6 +41,14 @@ efgh	efgh
 ijkl	ijkl
 DROP TABLE t1;
 #
+# Bug#45645 Mysql server close all connection and restart using lower function
+#
+CREATE TABLE t1 (a VARCHAR(10)) CHARACTER SET utf8 COLLATE utf8_test_ci;
+INSERT INTO t1 (a) VALUES ('hello!');
+SELECT * FROM t1 WHERE LOWER(a)=LOWER('N');
+a
+DROP TABLE t1;
+#
 # Bug#43827 Server closes connections and restarts
 #
 CREATE TABLE t1 (c1 VARCHAR(10) CHARACTER SET utf8 COLLATE utf8_test_ci);
diff --git a/mysql-test/t/ctype_ldml.test b/mysql-test/t/ctype_ldml.test
index bc04b93a935..0395de273de 100644
--- a/mysql-test/t/ctype_ldml.test
+++ b/mysql-test/t/ctype_ldml.test
@@ -37,6 +37,14 @@ UPDATE t1 SET col2=col1;
 SELECT * FROM t1 WHERE col1=col2 ORDER BY col1;
 DROP TABLE t1;
 
+--echo #
+--echo # Bug#45645 Mysql server close all connection and restart using lower function
+--echo #
+CREATE TABLE t1 (a VARCHAR(10)) CHARACTER SET utf8 COLLATE utf8_test_ci;
+INSERT INTO t1 (a) VALUES ('hello!');
+SELECT * FROM t1 WHERE LOWER(a)=LOWER('N');
+DROP TABLE t1;
+
 --echo #
 --echo # Bug#43827 Server closes connections and restarts
 --echo #
diff --git a/strings/ctype-uca.c b/strings/ctype-uca.c
index 2ea48ddab2f..9fb18c0c472 100644
--- a/strings/ctype-uca.c
+++ b/strings/ctype-uca.c
@@ -7858,6 +7858,8 @@ static my_bool create_tailoring(CHARSET_INFO *cs, void *(*alloc)(size_t))
     return 1;
   }
   
+  cs->caseinfo= my_unicase_default;
+  
   if (!(newweights= (uint16**) (*alloc)(256*sizeof(uint16*))))
     return 1;
   bzero(newweights, 256*sizeof(uint16*));